Merge 8.7. Add "ilp32" build flag

52 files changed, 727 insertions, 364 deletions

diff --git a/.github/workflows/mac-build.yml b/.github/workflows/mac-build.yml
index bf3c420..a57a6cf 100644
--- a/.github/workflows/mac-build.yml
+++ b/.github/workflows/mac-build.yml
@@ -2,7 +2,7 @@ name: macOS
 on: [push]
 jobs:
   xcode:
-    runs-on: macos-11.0
+    runs-on: macos-11
     defaults:
       run:
         shell: bash
@@ -24,7 +24,7 @@ jobs:
           ERROR_ON_FAILURES: 1
           MAC_CI: 1
   clang:
-    runs-on: macos-11.0
+    runs-on: macos-11
     strategy:
       matrix:
         cfgopt:
diff --git a/.github/workflows/onefiledist.yml b/.github/workflows/onefiledist.yml
index a60428d..f2f6c1e 100644
--- a/.github/workflows/onefiledist.yml
+++ b/.github/workflows/onefiledist.yml
@@ -27,18 +27,18 @@ jobs:
         working-directory: unix
       - name: Package
         run: |
-          cp ../unix/tclsh tclsh${TCL_PATCHLEVEL}_unofficial
-          chmod +x tclsh${TCL_PATCHLEVEL}_unofficial
-          tar -cf tclsh${TCL_PATCHLEVEL}_unofficial.tar tclsh${TCL_PATCHLEVEL}_unofficial
+          cp ../unix/tclsh tclsh${TCL_PATCHLEVEL}_snapshot
+          chmod +x tclsh${TCL_PATCHLEVEL}_snapshot
+          tar -cf tclsh${TCL_PATCHLEVEL}_snapshot.tar tclsh${TCL_PATCHLEVEL}_snapshot
         working-directory: 1dist
       - name: Upload
         uses: actions/upload-artifact@v2
         with:
-          name: Tclsh ${{ env.TCL_PATCHLEVEL }} Linux single-file build (unofficial)
+          name: Tclsh ${{ env.TCL_PATCHLEVEL }} Linux single-file build (snapshot)
           path: 1dist/*.tar
   macos:
     name: macOS
-    runs-on: macos-11.0
+    runs-on: macos-11
     defaults:
       run:
         shell: bash
@@ -74,8 +74,8 @@ jobs:
       - name: Package
         run: |
           mkdir contents
-          cp $TCL_BIN contents/tclsh${TCL_PATCHLEVEL}_unofficial
-          chmod +x contents/tclsh${TCL_PATCHLEVEL}_unofficial
+          cp $TCL_BIN contents/tclsh${TCL_PATCHLEVEL}_snapshot
+          chmod +x contents/tclsh${TCL_PATCHLEVEL}_snapshot
           cat > contents/README.txt <<EOF
           This is a single-file executable developer preview of Tcl $TCL_PATCHLEVEL
 
@@ -83,20 +83,20 @@ jobs:
           Use strictly at your own risk.
 
           To run it, you need to copy the executable out and run:
-              xattr -d com.apple.quarantine tclsh${TCL_PATCHLEVEL}_unofficial
+              xattr -d com.apple.quarantine tclsh${TCL_PATCHLEVEL}_snapshot
           to mark the executable as runnable on your machine.
           EOF
           $CREATE_DMG \
-              --volname "Tcl $TCL_PATCHLEVEL (unofficial)" \
+              --volname "Tcl $TCL_PATCHLEVEL (snapshot)" \
               --window-pos 200 120 \
               --window-size 800 400 \
-              "Tcl-$TCL_PATCHLEVEL-(unofficial).dmg" \
+              "Tcl-$TCL_PATCHLEVEL-(snapshot).dmg" \
               "contents/"
         working-directory: 1dist
       - name: Upload
         uses: actions/upload-artifact@v2
         with:
-          name: Tclsh ${{ env.TCL_PATCHLEVEL }} macOS single-file build (unofficial)
+          name: Tclsh ${{ env.TCL_PATCHLEVEL }} macOS single-file build (snapshot)
           path: 1dist/*.dmg
   win:
     name: Windows
@@ -129,10 +129,10 @@ jobs:
         working-directory: win
       - name: Set Executable Name
         run: |
-          cp ../win/tclsh*.exe tclsh${TCL_PATCHLEVEL}_unofficial.exe
+          cp ../win/tclsh*.exe tclsh${TCL_PATCHLEVEL}_snapshot.exe
         working-directory: 1dist
       - name: Upload
         uses: actions/upload-artifact@v2
         with:
-          name: Tclsh ${{ env.TCL_PATCHLEVEL }} Windows single-file build (unofficial)
-          path: '1dist/*_unofficial.exe'
+          name: Tclsh ${{ env.TCL_PATCHLEVEL }} Windows single-file build (snapshot)
+          path: '1dist/*_snapshot.exe'
diff --git a/doc/Access.3 b/doc/Access.3
index 699d7ed..5a29ec2 100644
--- a/doc/Access.3
+++ b/doc/Access.3
@@ -20,7 +20,7 @@ int
 \fBTcl_Stat\fR(\fIpath\fR, \fIstatPtr\fR)
 .SH ARGUMENTS
 .AS "struct stat" *statPtr out
-.AP char *path in
+.AP "const char" *path in
 Native name of the file to check the attributes of.
 .AP int mode in
 Mask consisting of one or more of \fBR_OK\fR, \fBW_OK\fR, \fBX_OK\fR and
diff --git a/doc/AddErrInfo.3 b/doc/AddErrInfo.3
index d04b4c9..53f134a 100644
--- a/doc/AddErrInfo.3
+++ b/doc/AddErrInfo.3
@@ -49,7 +49,7 @@ Interpreter in which to record information.
 The code returned from script evaluation.
 .AP Tcl_Obj *options
 A dictionary of return options.
-.AP char *message in
+.AP "const char" *message in
 For \fBTcl_AddErrorInfo\fR,
 this is a conventional C string to append to the \fB\-errorinfo\fR return option.
 For \fBTcl_AddObjErrorInfo\fR,
@@ -66,7 +66,7 @@ appending to the \fB\-errorinfo\fR return option.
 If negative, all bytes up to the first null byte are used.
 .AP Tcl_Obj *errorObjPtr in
 The \fB\-errorcode\fR return option will be set to this value.
-.AP char *element in
+.AP "const char" *element in
 String to record as one element of the \fB\-errorcode\fR return option.
 Last \fIelement\fR argument must be NULL.
 .AP va_list argList in
diff --git a/doc/Backslash.3 b/doc/Backslash.3
index 0805f8e..1a807f6 100644
--- a/doc/Backslash.3
+++ b/doc/Backslash.3
@@ -18,7 +18,7 @@ char
 \fBTcl_Backslash\fR(\fIsrc, countPtr\fR)
 .SH ARGUMENTS
 .AS char *countPtr out
-.AP char *src in
+.AP "const char" *src in
 Pointer to a string starting with a backslash.
 .AP int *countPtr out
 If \fIcountPtr\fR is not NULL, \fI*countPtr\fR gets filled
diff --git a/doc/CrtObjCmd.3 b/doc/CrtObjCmd.3
index 59b217e..f15e277 100644
--- a/doc/CrtObjCmd.3
+++ b/doc/CrtObjCmd.3
@@ -54,7 +54,7 @@ const char *
 .AS Tcl_CmdDeleteProc *deleteProc in/out
 .AP Tcl_Interp *interp in
 Interpreter in which to create a new command or that contains a command.
-.AP char *cmdName in
+.AP "const char" *cmdName in
 Name of command.
 .AP Tcl_ObjCmdProc *proc in
 Implementation of the new command: \fIproc\fR will be called whenever
diff --git a/doc/Eval.3 b/doc/Eval.3
index 2769595..5929a83 100644
--- a/doc/Eval.3
+++ b/doc/Eval.3
@@ -65,7 +65,7 @@ null terminating character.  If \-1, then all characters up to the
 first null byte are used.
 .AP "const char" *script in
 Points to first byte of script to execute (null-terminated and UTF-8).
-.AP char *part in
+.AP "const char" *part in
 String forming part of a Tcl script.
 .AP va_list argList in
 An argument list which must have been initialized using
diff --git a/doc/FileSystem.3 b/doc/FileSystem.3
index 4e901e0..4951ec5 100644
--- a/doc/FileSystem.3
+++ b/doc/FileSystem.3
@@ -1745,7 +1745,7 @@ to it should be retained.
 .
 If \fItoPtr\fR is NULL, this should return a value with reference count 1 that
 has just been allocated and passed to \fBTcl_IncrRefCount\fR. If \fItoPtr\fR
-is not NULL, it should be returned on success. 
+is not NULL, it should be returned on success.
 .TP
 \fIlistVolumesProc\fR
 .
diff --git a/doc/GetCwd.3 b/doc/GetCwd.3
index f4f37a1..b19f587 100644
--- a/doc/GetCwd.3
+++ b/doc/GetCwd.3
@@ -17,7 +17,7 @@ char *
 \fBTcl_GetCwd\fR(\fIinterp\fR, \fIbufferPtr\fR)
 .sp
 int
-\fBTcl_Chdir\fR(\fIpath\fR)
+\fBTcl_Chdir\fR(\fIdirName\fR)
 .SH ARGUMENTS
 .AS Tcl_DString *bufferPtr in/out
 .AP Tcl_Interp *interp in
@@ -27,7 +27,7 @@ This dynamic string is used to store the current working directory.
 At the time of the call it should be uninitialized or free.  The
 caller must eventually call \fBTcl_DStringFree\fR to free up
 anything stored here.
-.AP char *path in
+.AP "const char" *dirName in
 File path in UTF\-8 format.
 .BE
 
@@ -45,7 +45,7 @@ must call \fBTcl_DStringFree()\fR when the result is no longer needed.
 The format of the path is UTF\-8.
 .PP
 \fBTcl_Chdir\fR changes the applications current working directory to
-the value specified in \fIpath\fR.  The format of the passed in string
+the value specified in \fIdirName\fR.  The format of the passed in string
 must be UTF\-8.  The function returns -1 on error or 0 on success.
 
 .SH KEYWORDS
diff --git a/doc/NRE.3 b/doc/NRE.3
index 011e100..72bb370 100644
--- a/doc/NRE.3
+++ b/doc/NRE.3
@@ -40,7 +40,7 @@ void
 .AS Tcl_CmdDeleteProc *interp in
 .AP Tcl_Interp *interp in
 The relevant Interpreter.
-.AP char *cmdName in
+.AP "const char" *cmdName in
 Name of the command to create.
 .AP Tcl_ObjCmdProc *proc in
 Called in order to evaluate a command.  Is often just a small wrapper that uses
@@ -245,7 +245,7 @@ Use \fBTcl_NRAddCallback\fR to schedule any required final decrementing of the
 reference counts of arguments to any of the other functions on this page, as
 with any other post-processing step in the non-recursive execution engine.
 .PP
-The 
+The
 .SH "SEE ALSO"
 Tcl_CreateCommand(3), Tcl_CreateObjCommand(3), Tcl_EvalObjEx(3), Tcl_GetCommandFromObj(3), Tcl_ExprObj(3)
 .SH KEYWORDS
diff --git a/doc/ParseArgs.3 b/doc/ParseArgs.3
index 5ca9fa5..f29f161 100644
--- a/doc/ParseArgs.3
+++ b/doc/ParseArgs.3
@@ -191,7 +191,7 @@ came from, and so should be copied if it needs to be retained. The
 \fIsrcPtr\fR and \fIclientData\fR fields are ignored.
 .SH "REFERENCE COUNT MANAGEMENT"
 .PP
-The values in the \fiobjv\fR argument to \fBTcl_ParseArgsObjv\fR will not have
+The values in the \fIobjv\fR argument to \fBTcl_ParseArgsObjv\fR will not have
 their reference counts modified by this function. The interpreter result may
 be modified on error; the values passed should not be the interpreter result
 with no further reference added.
diff --git a/doc/RegExp.3 b/doc/RegExp.3
index 0d60b8a..40429c9 100644
--- a/doc/RegExp.3
+++ b/doc/RegExp.3
@@ -51,14 +51,14 @@ can be efficiently searched.
 .AP Tcl_Obj *patObj in/out
 Refers to the value from which to get a regular expression. The
 compiled regular expression is cached in the value.
-.AP char *text in
+.AP "const char" *text in
 Text to search for a match with a regular expression.
 .AP "const char" *pattern in
 String in the form of a regular expression pattern.
 .AP Tcl_RegExp regexp in
 Compiled regular expression.  Must have been returned previously
 by \fBTcl_GetRegExpFromObj\fR or \fBTcl_RegExpCompile\fR.
-.AP char *start in
+.AP "const char" *start in
 If \fItext\fR is just a portion of some other string, this argument
 identifies the beginning of the larger string.
 If it is not the same as \fItext\fR, then no
diff --git a/doc/SplitList.3 b/doc/SplitList.3
index d19ca14..863e322 100644
--- a/doc/SplitList.3
+++ b/doc/SplitList.3
@@ -36,7 +36,7 @@ int
 .AP Tcl_Interp *interp out
 Interpreter to use for error reporting.  If NULL, then no error message
 is left.
-.AP char *list in
+.AP "const char" *list in
 Pointer to a string with proper list structure.
 .AP int *argcPtr out
 Filled in with number of elements in \fIlist\fR.
diff --git a/doc/StringObj.3 b/doc/StringObj.3
index 22e872a..772073e 100644
--- a/doc/StringObj.3
+++ b/doc/StringObj.3
@@ -385,7 +385,7 @@ cleaner-looking. \fBTcl_ConcatObj\fR returns a pointer to a
 newly-created value whose ref count is zero.
 .SH "REFERENCE COUNT MANAGEMENT"
 .PP
-\fBTcl_NewStringObj\fR, \fBTcl_NewUnicodeObj\fB, \fBTcl_Format\fR,
+\fBTcl_NewStringObj\fR, \fBTcl_NewUnicodeObj\fR, \fBTcl_Format\fR,
 \fBTcl_ObjPrintf\fR, and \fBTcl_ConcatObj\fR always return a zero-reference
 object, much like \fBTcl_NewObj\fR.
 .PP
diff --git a/doc/UniCharIsAlpha.3 b/doc/UniCharIsAlpha.3
index 61490ed..a07af9a 100644
--- a/doc/UniCharIsAlpha.3
+++ b/doc/UniCharIsAlpha.3
@@ -8,7 +8,7 @@
 .so man.macros
 .BS
 .SH NAME
-Tcl_UniCharIsAlnum, Tcl_UniCharIsAlpha, Tcl_UniCharIsControl, Tcl_UniCharIsDigit, Tcl_UniCharIsGraph, Tcl_UniCharIsLower, Tcl_UniCharIsPrint, Tcl_UniCharIsPunct, Tcl_UniCharIsSpace, Tcl_UniCharIsUpper, Tcl_UniCharIsWordChar \- routines for classification of Tcl_UniChar characters
+Tcl_UniCharIsAlnum, Tcl_UniCharIsAlpha, Tcl_UniCharIsControl, Tcl_UniCharIsDigit, Tcl_UniCharIsGraph, Tcl_UniCharIsLower, Tcl_UniCharIsPrint, Tcl_UniCharIsPunct, Tcl_UniCharIsSpace, Tcl_UniCharIsUpper, Tcl_UniCharIsUnicode, Tcl_UniCharIsWordChar \- routines for classification of Tcl_UniChar characters
 .SH SYNOPSIS
 .nf
 \fB#include <tcl.h>\fR
@@ -44,6 +44,9 @@ int
 \fBTcl_UniCharIsUpper\fR(\fIch\fR)
 .sp
 int
+\fBTcl_UniCharIsUnicode\fR(\fIch\fR)
+.sp
+int
 \fBTcl_UniCharIsWordChar\fR(\fIch\fR)
 .SH ARGUMENTS
 .AS int ch
@@ -81,6 +84,9 @@ with the various routines.
 .PP
 \fBTcl_UniCharIsUpper\fR tests if the character is an uppercase Unicode character.
 .PP
+\fBTcl_UniCharIsUnicode\fR tests if the character is a Unicode character, not being
+a surrogate or noncharacter.
+.PP
 \fBTcl_UniCharIsWordChar\fR tests if the character is alphanumeric or
 a connector punctuation mark.
 
diff --git a/doc/encoding.n b/doc/encoding.n
index 5aac181..e78a8e7 100644
--- a/doc/encoding.n
+++ b/doc/encoding.n
@@ -81,29 +81,13 @@ omitted then the command returns the current system encoding.  The
 system encoding is used whenever Tcl passes strings to system calls.
 .SH EXAMPLE
 .PP
-It is common practice to write script files using a text editor that
-produces output in the euc-jp encoding, which represents the ASCII
-characters as singe bytes and Japanese characters as two bytes.  This
-makes it easy to embed literal strings that correspond to non-ASCII
-characters by simply typing the strings in place in the script.
-However, because the \fBsource\fR command always reads files using the
-current system encoding, Tcl will only source such files correctly
-when the encoding used to write the file is the same.  This tends not
-to be true in an internationalized setting.  For example, if such a
-file was sourced in North America (where the ISO8859\-1 is normally
-used), each byte in the file would be treated as a separate character
-that maps to the 00 page in Unicode.  The resulting Tcl strings will
-not contain the expected Japanese characters.  Instead, they will
-contain a sequence of Latin-1 characters that correspond to the bytes
-of the original string.  The \fBencoding\fR command can be used to
-convert this string to the expected Japanese Unicode characters.  For
-example,
+The following example converts a byte sequence in Japanese euc-jp encoding to a TCL string:
 .PP
 .CS
 set s [\fBencoding convertfrom\fR euc-jp "\exA4\exCF"]
 .CE
 .PP
-would return the Unicode string
+The result is the unicode codepoint:
 .QW "\eu306F" ,
 which is the Hiragana letter HA.
 .SH "SEE ALSO"
diff --git a/doc/string.n b/doc/string.n
index 7413e6b..f3d7616 100644
--- a/doc/string.n
+++ b/doc/string.n
@@ -413,10 +413,10 @@ store the representation is of very low value (except to C extension
 code, which has direct access for the purpose of memory management,
 etc.)
 .PP
-\fICompatibility note:\fR it is likely that this subcommand will be
-withdrawn in a future version of Tcl. It is better to use the
-\fBencoding convertto\fR command to convert a string to a known
-encoding and then apply \fBstring length\fR to that.
+\fICompatibility note:\fR This subcommand is deprecated and will
+be removed in Tcl 9.0. It is better to use the \fBencoding convertto\fR
+command to convert a string to a known encoding (e.g. "utf-8" or "cesu-8")
+and then apply \fBstring length\fR to that.
 .PP
 .CS
 \fBstring length\fR [encoding convertto utf-8 $theString]
diff --git a/generic/tcl.decls b/generic/tcl.decls
index 08800f0..9d030e0 100644
--- a/generic/tcl.decls
+++ b/generic/tcl.decls
@@ -2423,6 +2423,9 @@ declare 655 {
 declare 656 {
     const char *Tcl_UtfPrev(const char *src, const char *start)
 }
+declare 657 {
+    int Tcl_UniCharIsUnicode(int ch)
+}
 
 # ----- BASELINE -- FOR -- 8.7.0 ----- #
 
diff --git a/generic/tclBasic.c b/generic/tclBasic.c
index 833101c..f083c37 100644
--- a/generic/tclBasic.c
+++ b/generic/tclBasic.c
@@ -1826,28 +1826,28 @@ DeleteInterpProc(
 	ckfree(hTablePtr);
     }
 
-    /*
-     * Invoke deletion callbacks; note that a callback can create new
-     * callbacks, so we iterate.
-     */
 
-    while (iPtr->assocData != NULL) {
+    if (iPtr->assocData != NULL) {
 	AssocData *dPtr;
 
 	hTablePtr = iPtr->assocData;
-	iPtr->assocData = NULL;
+	/*
+	 * Invoke deletion callbacks; note that a callback can create new
+	 * callbacks, so we iterate.
+	 */
 	for (hPtr = Tcl_FirstHashEntry(hTablePtr, &search);
 		hPtr != NULL;
 		hPtr = Tcl_FirstHashEntry(hTablePtr, &search)) {
 	    dPtr = (AssocData *)Tcl_GetHashValue(hPtr);
-	    Tcl_DeleteHashEntry(hPtr);
 	    if (dPtr->proc != NULL) {
 		dPtr->proc(dPtr->clientData, interp);
 	    }
+	    Tcl_DeleteHashEntry(hPtr);
 	    ckfree(dPtr);
 	}
 	Tcl_DeleteHashTable(hTablePtr);
 	ckfree(hTablePtr);
+	iPtr->assocData = NULL;
     }
 
     /*
@@ -3505,15 +3505,14 @@ Tcl_DeleteCommandFromToken(
     cmdPtr->flags |= CMD_DYING;
 
     /*
-     * Call trace functions for the command being deleted. Then delete its
-     * traces.
+     * Call each functions and then delete the trace.
      */
 
     cmdPtr->nsPtr->refCount++;
 
     if (cmdPtr->tracePtr != NULL) {
 	CommandTrace *tracePtr;
-	/* Note that CallCommandTraces() never frees cmdPtr, that's
+	/* CallCommandTraces() does not cmdPtr, that's
 	 * done just before Tcl_DeleteCommandFromToken() returns  */
 	CallCommandTraces(iPtr,cmdPtr,NULL,NULL,TCL_TRACE_DELETE);
 
diff --git a/generic/tclCmdAH.c b/generic/tclCmdAH.c
index c09ad95..8e6200d 100644
--- a/generic/tclCmdAH.c
+++ b/generic/tclCmdAH.c
@@ -613,8 +613,6 @@ EncodingConverttoObjCmd(
     int length;			/* Length of the string being converted */
     const char *stringPtr;	/* Pointer to the first byte of the string */
 
-    /* TODO - ADJUST OBJ INDICES WHEN ENSEMBLIFYING THIS */
-
     if (objc == 2) {
 	encoding = Tcl_GetEncoding(interp, NULL);
 	data = objv[1];
diff --git a/generic/tclCmdMZ.c b/generic/tclCmdMZ.c
index d020a93..6f71198 100644
--- a/generic/tclCmdMZ.c
+++ b/generic/tclCmdMZ.c
@@ -1533,16 +1533,16 @@ StringIsCmd(
 	"boolean",	"dict",		"digit",	"double",
 	"entier",	"false",	"graph",	"integer",
 	"list",		"lower",	"print",	"punct",
-	"space",	"true",		"upper",	"wideinteger",
-	"wordchar",	"xdigit",	NULL
+	"space",	"true",		"upper",	"unicode",
+	"wideinteger", "wordchar",	"xdigit",	NULL
     };
     enum isClassesEnum {
 	STR_IS_ALNUM,	STR_IS_ALPHA,	STR_IS_ASCII,	STR_IS_CONTROL,
 	STR_IS_BOOL,	STR_IS_DICT,	STR_IS_DIGIT,	STR_IS_DOUBLE,
 	STR_IS_ENTIER,	STR_IS_FALSE,	STR_IS_GRAPH,	STR_IS_INT,
 	STR_IS_LIST,	STR_IS_LOWER,	STR_IS_PRINT,	STR_IS_PUNCT,
-	STR_IS_SPACE,	STR_IS_TRUE,	STR_IS_UPPER,	STR_IS_WIDE,
-	STR_IS_WORD,	STR_IS_XDIGIT
+	STR_IS_SPACE,	STR_IS_TRUE,	STR_IS_UPPER,	STR_IS_UNICODE,
+	STR_IS_WIDE,	STR_IS_WORD,	STR_IS_XDIGIT
     };
     static const char *const isOptions[] = {
 	"-strict", "-failindex", NULL
@@ -1872,6 +1872,9 @@ StringIsCmd(
     case STR_IS_UPPER:
 	chcomp = Tcl_UniCharIsUpper;
 	break;
+    case STR_IS_UNICODE:
+	chcomp = Tcl_UniCharIsUnicode;
+	break;
     case STR_IS_WORD:
 	chcomp = Tcl_UniCharIsWordChar;
 	break;
@@ -2832,6 +2835,7 @@ StringCatCmd(
  *
  *----------------------------------------------------------------------
  */
+#if TCL_MAJOR_VERSION < 9 && !defined(TCL_NO_DEPRECATED)
 static int
 StringBytesCmd(
     TCL_UNUSED(ClientData),
@@ -2850,6 +2854,7 @@ StringBytesCmd(
     Tcl_SetObjResult(interp, Tcl_NewWideIntObj(length));
     return TCL_OK;
 }
+#endif
 
 /*
  *----------------------------------------------------------------------
@@ -3306,7 +3311,9 @@ TclInitStringCmd(
     Tcl_Interp *interp)		/* Current interpreter. */
 {
     static const EnsembleImplMap stringImplMap[] = {
+#if TCL_MAJOR_VERSION < 9 && !defined(TCL_NO_DEPRECATED)
 	{"bytelength",	StringBytesCmd,	TclCompileBasic1ArgCmd, NULL, NULL, 0},
+#endif
 	{"cat",		StringCatCmd,	TclCompileStringCatCmd, NULL, NULL, 0},
 	{"compare",	StringCmpCmd,	TclCompileStringCmpCmd, NULL, NULL, 0},
 	{"equal",	StringEqualCmd,	TclCompileStringEqualCmd, NULL, NULL, 0},
diff --git a/generic/tclCompCmdsSZ.c b/generic/tclCompCmdsSZ.c
index 0bac52b..a160625 100644
--- a/generic/tclCompCmdsSZ.c
+++ b/generic/tclCompCmdsSZ.c
@@ -505,19 +505,19 @@ TclCompileStringIsCmd(
     Tcl_Token *tokenPtr = TokenAfter(parsePtr->tokenPtr);
     static const char *const isClasses[] = {
 	"alnum",	"alpha",	"ascii",	"control",
-	"boolean",	"dict", "digit",	"double",	"entier",
-	"false",	"graph",	"integer",	"list",
-	"lower",	"print",	"punct",	"space",
-	"true",		"upper",	"wideinteger",	"wordchar",
-	"xdigit",	NULL
+	"boolean",	"dict",		"digit",	"double",
+	"entier",	"false",	"graph",	"integer",
+	"list",		"lower",	"print",	"punct",
+	"space",	"true",		"upper",	"unicode",
+	"wideinteger", "wordchar",	"xdigit",	NULL
     };
     enum isClassesEnum {
 	STR_IS_ALNUM,	STR_IS_ALPHA,	STR_IS_ASCII,	STR_IS_CONTROL,
-	STR_IS_BOOL,	STR_IS_DICT, STR_IS_DIGIT,	STR_IS_DOUBLE,	STR_IS_ENTIER,
-	STR_IS_FALSE,	STR_IS_GRAPH,	STR_IS_INT,	STR_IS_LIST,
-	STR_IS_LOWER,	STR_IS_PRINT,	STR_IS_PUNCT,	STR_IS_SPACE,
-	STR_IS_TRUE,	STR_IS_UPPER,	STR_IS_WIDE,	STR_IS_WORD,
-	STR_IS_XDIGIT
+	STR_IS_BOOL,	STR_IS_DICT,	STR_IS_DIGIT,	STR_IS_DOUBLE,
+	STR_IS_ENTIER,	STR_IS_FALSE,	STR_IS_GRAPH,	STR_IS_INT,
+	STR_IS_LIST,	STR_IS_LOWER,	STR_IS_PRINT,	STR_IS_PUNCT,
+	STR_IS_SPACE,	STR_IS_TRUE,	STR_IS_UPPER,	STR_IS_UNICODE,
+	STR_IS_WIDE,	STR_IS_WORD,	STR_IS_XDIGIT
     };
     int t, range, allowEmpty = 0, end;
     InstStringClassType strClassType;
@@ -609,6 +609,9 @@ TclCompileStringIsCmd(
     case STR_IS_UPPER:
 	strClassType = STR_CLASS_UPPER;
 	goto compileStrClass;
+    case STR_IS_UNICODE:
+	strClassType = STR_CLASS_UNICODE;
+	goto compileStrClass;
     case STR_IS_WORD:
 	strClassType = STR_CLASS_WORD;
 	goto compileStrClass;
@@ -1415,6 +1418,7 @@ StringClassDesc const tclStringClassTable[] = {
     {"upper",	Tcl_UniCharIsUpper},
     {"word",	Tcl_UniCharIsWordChar},
     {"xdigit",	UniCharIsHexDigit},
+    {"unicode",	Tcl_UniCharIsUnicode},
     {"",	NULL}
 };
 
diff --git a/generic/tclCompile.h b/generic/tclCompile.h
index 21a27f7..6a5faaf 100644
--- a/generic/tclCompile.h
+++ b/generic/tclCompile.h
@@ -922,8 +922,9 @@ typedef enum InstStringClassType {
     STR_CLASS_UPPER,		/* Unicode upper-case alphabet characters. */
     STR_CLASS_WORD,		/* Unicode word (alphabetic, digit, connector
 				 * punctuation) characters. */
-    STR_CLASS_XDIGIT		/* Characters that can be used as digits in
+    STR_CLASS_XDIGIT,		/* Characters that can be used as digits in
 				 * hexadecimal numbers ([0-9A-Fa-f]). */
+    STR_CLASS_UNICODE		/* Unicode characters. */
 } InstStringClassType;
 
 typedef struct StringClassDesc {
diff --git a/generic/tclDecls.h b/generic/tclDecls.h
index 83ed09f..8b9aeee 100644
--- a/generic/tclDecls.h
+++ b/generic/tclDecls.h
@@ -1937,6 +1937,8 @@ EXTERN int		Tcl_UtfCharComplete(const char *src, int length);
 EXTERN const char *	Tcl_UtfNext(const char *src);
 /* 656 */
 EXTERN const char *	Tcl_UtfPrev(const char *src, const char *start);
+/* 657 */
+EXTERN int		Tcl_UniCharIsUnicode(int ch);
 
 typedef struct {
     const struct TclPlatStubs *tclPlatStubs;
@@ -2629,6 +2631,7 @@ typedef struct TclStubs {
     int (*tcl_UtfCharComplete) (const char *src, int length); /* 654 */
     const char * (*tcl_UtfNext) (const char *src); /* 655 */
     const char * (*tcl_UtfPrev) (const char *src, const char *start); /* 656 */
+    int (*tcl_UniCharIsUnicode) (int ch); /* 657 */
 } TclStubs;
 
 extern const TclStubs *tclStubsPtr;
@@ -3971,6 +3974,8 @@ extern const TclStubs *tclStubsPtr;
 	(tclStubsPtr->tcl_UtfNext) /* 655 */
 #define Tcl_UtfPrev \
 	(tclStubsPtr->tcl_UtfPrev) /* 656 */
+#define Tcl_UniCharIsUnicode \
+	(tclStubsPtr->tcl_UniCharIsUnicode) /* 657 */
 
 #endif /* defined(USE_TCL_STUBS) */
 
diff --git a/generic/tclEncoding.c b/generic/tclEncoding.c
index 8c4897e..d6c280f 100644
--- a/generic/tclEncoding.c
+++ b/generic/tclEncoding.c
@@ -510,11 +510,12 @@ FillEncodingFileMap(void)
  *---------------------------------------------------------------------------
  */
 
-/* This flags must not conflict with other TCL_ENCODING_* flags in tcl.h */
+/* Those flags must not conflict with other TCL_ENCODING_* flags in tcl.h */
+/* Since TCL_ENCODING_MODIFIED is only used for utf-8/cesu-8 and
+ * TCL_ENCODING_LE is only used for  utf-16/ucs-2. re-use the same value */
 #define TCL_ENCODING_MODIFIED	0x20	/* Converting NULL bytes to 0xC0 0x80 */
-/* Since TCL_ENCODING_MODIFIED is only used for utf-8 and
- * TCL_ENCODING_LE is only used for  utf-16/ucs-2, re-use the same value */
 #define TCL_ENCODING_LE		TCL_ENCODING_MODIFIED	/* Little-endian encoding */
+#define TCL_ENCODING_UTF	0x200	/* For UTF-8 encoding, allow 4-byte output sequences */
 
 void
 TclInitEncodingSubsystem(void)
@@ -556,7 +557,10 @@ TclInitEncodingSubsystem(void)
     type.fromUtfProc	= UtfToUtfProc;
     type.freeProc	= NULL;
     type.nullSize	= 1;
-    type.clientData	= NULL;
+    type.clientData	= INT2PTR(TCL_ENCODING_UTF);
+    Tcl_CreateEncoding(&type);
+    type.clientData	= INT2PTR(0);
+    type.encodingName	= "cesu-8";
     Tcl_CreateEncoding(&type);
 
     type.toUtfProc	= Utf16ToUtfProc;
@@ -1141,7 +1145,7 @@ Tcl_ExternalToUtfDString(
 
     flags = TCL_ENCODING_START | TCL_ENCODING_END;
     if (encodingPtr->toUtfProc == UtfToUtfProc) {
-	flags |= TCL_ENCODING_MODIFIED;
+	flags |= TCL_ENCODING_MODIFIED | TCL_ENCODING_UTF;
     }
 
     while (1) {
@@ -1258,7 +1262,7 @@ Tcl_ExternalToUtf(
 	dstLen--;
     }
     if (encodingPtr->toUtfProc == UtfToUtfProc) {
-	flags |= TCL_ENCODING_MODIFIED;
+	flags |= TCL_ENCODING_MODIFIED | TCL_ENCODING_UTF;
     }
     do {
 	Tcl_EncodingState savedState = *statePtr;
@@ -1337,6 +1341,7 @@ Tcl_UtfToExternalDString(
 		&srcRead, &dstWrote, &dstChars);
 	soFar = dst + dstWrote - Tcl_DStringValue(dstPtr);
 
+	src += srcRead;
 	if (result != TCL_CONVERT_NOSPACE) {
 	    if (encodingPtr->nullSize == 2) {
 		Tcl_DStringSetLength(dstPtr, soFar + 1);
@@ -1346,7 +1351,6 @@ Tcl_UtfToExternalDString(
 	}
 
 	flags &= ~TCL_ENCODING_START;
-	src += srcRead;
 	srcLen -= srcRead;
 	if (Tcl_DStringLength(dstPtr) == 0) {
 	    Tcl_DStringSetLength(dstPtr, dstLen);
@@ -2216,7 +2220,7 @@ UtfToUtfProc(
 
     dstStart = dst;
     flags |= PTR2INT(clientData);
-    dstEnd = dst + dstLen - TCL_UTF_MAX;
+    dstEnd = dst + dstLen - ((flags & TCL_ENCODING_UTF) ? TCL_UTF_MAX : 6);
 
     for (numChars = 0; src < srcEnd && numChars <= charLimit; numChars++) {
 	if ((src > srcClose) && (!Tcl_UtfCharComplete(src, srcEnd - src))) {
@@ -2269,6 +2273,7 @@ UtfToUtfProc(
 	    dst += Tcl_UniCharToUtf(ch, dst);
 	} else {
 	    int low;
+	    const char *saveSrc = src;
 	    size_t len = TclUtfToUCS4(src, &ch);
 	    if ((len < 2) && (ch != 0) && (flags & TCL_ENCODING_STOPONERROR)
 		    && (flags & TCL_ENCODING_MODIFIED)) {
@@ -2276,7 +2281,17 @@ UtfToUtfProc(
 		break;
 	    }
 	    src += len;
-	    if ((ch | 0x7FF) == 0xDFFF) {
+	    if (!(flags & TCL_ENCODING_UTF)) {
+		if (ch > 0xFFFF) {
+		    /* CESU-8 6-byte sequence for chars > U+FFFF */
+		    ch -= 0x10000;
+		    *dst++ = 0xED;
+		    *dst++ = (char) (((ch >> 16) & 0x0F) | 0xA0);
+		    *dst++ = (char) (((ch >> 10) & 0x3F) | 0x80);
+		    ch = (ch & 0x0CFF) | 0xDC00;
+		}
+		goto cesu8;
+	    } else if ((ch | 0x7FF) == 0xDFFF) {
 		/*
 		 * A surrogate character is detected, handle especially.
 		 */
@@ -2285,6 +2300,15 @@ UtfToUtfProc(
 		len = (src <= srcEnd-3) ? TclUtfToUCS4(src, &low) : 0;
 
 		if (((low & ~0x3FF) != 0xDC00) || (ch & 0x400)) {
+		    if (flags & TCL_ENCODING_STOPONERROR) {
+			result = TCL_CONVERT_UNKNOWN;
+			src = saveSrc;
+			break;
+		    }
+		    if (!(flags & TCL_ENCODING_MODIFIED)) {
+			ch = 0xFFFD;
+		    }
+		cesu8:
 		    *dst++ = (char) (((ch >> 12) | 0xE0) & 0xEF);
 		    *dst++ = (char) (((ch >> 6) | 0x80) & 0xBF);
 		    *dst++ = (char) ((ch | 0x80) & 0xBF);
@@ -2293,6 +2317,15 @@ UtfToUtfProc(
 		src += len;
 		dst += Tcl_UniCharToUtf(ch, dst);
 		ch = low;
+	    } else if (!Tcl_UniCharIsUnicode(ch)) {
+		if (flags & TCL_ENCODING_STOPONERROR) {
+		    result = TCL_CONVERT_UNKNOWN;
+		    src = saveSrc;
+		    break;
+		}
+		if (!(flags & TCL_ENCODING_MODIFIED)) {
+		    ch = 0xFFFD;
+		}
 	    }
 	    dst += Tcl_UniCharToUtf(ch, dst);
 	}
@@ -2451,7 +2484,7 @@ UtfToUtf16Proc(
 {
     const char *srcStart, *srcEnd, *srcClose, *dstStart, *dstEnd;
     int result, numChars;
-    int ch;
+    int ch, len;
 
     srcStart = src;
     srcEnd = src + srcLen;
@@ -2479,7 +2512,15 @@ UtfToUtf16Proc(
 	    result = TCL_CONVERT_NOSPACE;
 	    break;
 	}
-	src += TclUtfToUCS4(src, &ch);
+	len = TclUtfToUCS4(src, &ch);
+	if (!Tcl_UniCharIsUnicode(ch)) {
+	    if (flags & TCL_ENCODING_STOPONERROR) {
+		result = TCL_CONVERT_UNKNOWN;
+		break;
+	    }
+	    ch = 0xFFFD;
+	}
+	src += len;
 	if (flags & TCL_ENCODING_LE) {
 	    if (ch <= 0xFFFF) {
 		*dst++ = (ch & 0xFF);
diff --git a/generic/tclEnsemble.c b/generic/tclEnsemble.c
index 929f3ef..ccd43b9 100644
--- a/generic/tclEnsemble.c
+++ b/generic/tclEnsemble.c
@@ -165,7 +165,7 @@ TclNamespaceEnsembleCmd(
     const char *simpleName;
     int index, done;
 
-    if (nsPtr == NULL || nsPtr->flags & NS_DYING) {
+    if (nsPtr == NULL || nsPtr->flags & NS_DEAD) {
 	if (!Tcl_InterpDeleted(interp)) {
 	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
 		    "tried to manipulate ensemble of deleted namespace",
@@ -1730,7 +1730,7 @@ NsEnsembleImplementationCmdNR(
 	return TCL_ERROR;
     }
 
-    if (ensemblePtr->nsPtr->flags & NS_DYING) {
+    if (ensemblePtr->nsPtr->flags & NS_DEAD) {
 	/*
 	 * Don't know how we got here, but make things give up quickly.
 	 */
diff --git a/generic/tclEvent.c b/generic/tclEvent.c
index f851c8a..6096323 100644
--- a/generic/tclEvent.c
+++ b/generic/tclEvent.c
@@ -1105,6 +1105,9 @@ Tcl_InitSubsystems(void)
 #endif
 	    STRINGIFY(__GNUC_MINOR__)
 #endif
+#if (defined(_WIN32) && !defined(_WIN64)) || (ULONG_MAX == 0xffffffffUL)
+	    ".ilp32"
+#endif
 #ifdef TCL_MEM_DEBUG
 	    ".memdebug"
 #endif
diff --git a/generic/tclExecute.c b/generic/tclExecute.c
index 55bc314..debb06e 100644
--- a/generic/tclExecute.c
+++ b/generic/tclExecute.c
@@ -5744,7 +5744,7 @@ TEBCresume(
     {
 	ClientData ptr1, ptr2;
 	int type1, type2;
-	Tcl_WideInt w1, w2, wResult;
+	Tcl_WideInt w1 = 0, w2, wResult;
 
     case INST_NUM_TYPE:
 	if (GetNumberFromObj(NULL, OBJ_AT_TOS, &ptr1, &type1) != TCL_OK) {
@@ -8817,7 +8817,7 @@ ExecuteExtendedUnaryMathOp(
     int opcode,			/* What operation to perform. */
     Tcl_Obj *valuePtr)		/* The operand on the stack. */
 {
-    ClientData ptr;
+    ClientData ptr = NULL;
     int type;
     Tcl_WideInt w;
     mp_int big;
diff --git a/generic/tclIO.c b/generic/tclIO.c
index b9ec2a7..d704d29 100644
--- a/generic/tclIO.c
+++ b/generic/tclIO.c
@@ -4321,6 +4321,7 @@ Write(
 				/* State info for channel */
     char *nextNewLine = NULL;
     int endEncoding, saved = 0, total = 0, flushed = 0, needNlFlush = 0;
+    char safe[BUFFER_PADDING];
 
     if (srcLen) {
         WillWrite(chanPtr);
@@ -4339,7 +4340,7 @@ Write(
 
     while (srcLen + saved + endEncoding > 0) {
 	ChannelBuffer *bufPtr;
-	char *dst, safe[BUFFER_PADDING];
+	char *dst;
 	int result, srcRead, dstLen, dstWrote, srcLimit = srcLen;
 
 	if (nextNewLine) {
@@ -4384,7 +4385,7 @@ Write(
 
 	    ReleaseChannelBuffer(bufPtr);
 	    if (total == 0) {
-		Tcl_SetErrno(EINVAL);
+		Tcl_SetErrno(EILSEQ);
 		return -1;
 	    }
 	    break;
diff --git a/generic/tclInt.h b/generic/tclInt.h
index b8ed3c1..ad9a5c1 100644
--- a/generic/tclInt.h
+++ b/generic/tclInt.h
@@ -415,29 +415,27 @@ struct NamespacePathEntry {
  * Flags used to represent the status of a namespace:
  *
  * NS_DYING -	1 means Tcl_DeleteNamespace has been called to delete the
- *		namespace but there are still active call frames on the Tcl
+ *		namespace.  There may still be active call frames on the Tcl
  *		stack that refer to the namespace. When the last call frame
- *		referring to it has been popped, it's variables and command
- *		will be destroyed and it will be marked "dead" (NS_DEAD). The
- *		namespace can no longer be looked up by name.
+ *		referring to it has been popped, its remaining variables and
+ *		commands are destroyed and it is marked "dead" (NS_DEAD).
+ * NS_TEARDOWN  -1 means that TclTeardownNamespace has already been called on
+ *		this namespace and it should not be called again [Bug 1355942].
  * NS_DEAD -	1 means Tcl_DeleteNamespace has been called to delete the
- *		namespace and no call frames still refer to it. Its variables
- *		and command have already been destroyed. This bit allows the
- *		namespace resolution code to recognize that the namespace is
- *		"deleted". When the last namespaceName object in any byte code
- *		unit that refers to the namespace has been freed (i.e., when
- *		the namespace's refCount is 0), the namespace's storage will
- *		be freed.
- * NS_KILLED -	1 means that TclTeardownNamespace has already been called on
- *		this namespace and it should not be called again [Bug 1355942]
+ *		namespace and no call frames still refer to it. It is no longer
+ *		accessible by name. Its variables and commands have already
+ *		been destroyed.  When the last namespaceName object in any byte
+ *		code unit that refers to the namespace has been freed (i.e.,
+ *		when the namespace's refCount is 0), the namespace's storage
+ *		will be freed.
  * NS_SUPPRESS_COMPILATION -
  *		Marks the commands in this namespace for not being compiled,
  *		forcing them to be looked up every time.
  */
 
 #define NS_DYING	0x01
-#define NS_DEAD		0x02
-#define NS_KILLED	0x04
+#define NS_TEARDOWN	0x02
+#define NS_DEAD		0x04
 #define NS_SUPPRESS_COMPILATION	0x08
 
 /*
@@ -2958,6 +2956,7 @@ MODULE_SCOPE Tcl_Command TclCreateEnsembleInNs(Tcl_Interp *interp,
 			    const char *name, Tcl_Namespace *nameNamespacePtr,
 			    Tcl_Namespace *ensembleNamespacePtr, int flags);
 MODULE_SCOPE void	TclDeleteNamespaceVars(Namespace *nsPtr);
+MODULE_SCOPE void	TclDeleteNamespaceChildren(Namespace *nsPtr);
 MODULE_SCOPE int	TclFindDictElement(Tcl_Interp *interp,
 			    const char *dict, int dictLength,
 			    const char **elementPtr, const char **nextPtr,
diff --git a/generic/tclLoad.c b/generic/tclLoad.c
index c9d1b31..ed2be03 100644
--- a/generic/tclLoad.c
+++ b/generic/tclLoad.c
@@ -12,6 +12,7 @@
 
 #include "tclInt.h"
 
+
 /*
  * The following structure describes a library that has been loaded either
  * dynamically (with the "load" command) or statically (as indicated by a call
@@ -93,8 +94,20 @@ typedef struct InterpLibrary {
  * Prototypes for functions that are private to this file:
  */
 
-static void		LoadCleanupProc(ClientData clientData,
-			    Tcl_Interp *interp);
+static void	LoadCleanupProc(ClientData clientData,
+		    Tcl_Interp *interp);
+static int	IsStatic (LoadedLibrary *libraryPtr);
+static int	UnloadLibrary(Tcl_Interp *interp, Tcl_Interp *target,
+		    LoadedLibrary *library, int keepLibrary,
+		    const char *fullFileName, int interpExiting);
+
+
+static int
+IsStatic (LoadedLibrary *libraryPtr) {
+    int res;
+    res = (libraryPtr->fileName[0] == '\0');
+    return res;
+}
 
 /*
  *----------------------------------------------------------------------
@@ -547,12 +560,10 @@ Tcl_UnloadObjCmd(
     Tcl_Obj *const objv[])	/* Argument objects. */
 {
     Tcl_Interp *target;		/* Which interpreter to unload from. */
-    LoadedLibrary *libraryPtr, *defaultPtr;
+    LoadedLibrary *libraryPtr;
     Tcl_DString pfx, tmp;
-    Tcl_LibraryUnloadProc *unloadProc;
     InterpLibrary *ipFirstPtr, *ipPtr;
     int i, index, code, complain = 1, keepLibrary = 0;
-    int trustedRefCount = -1, safeRefCount = -1;
     const char *fullFileName = "";
     const char *prefix;
     static const char *const options[] = {
@@ -646,12 +657,11 @@ Tcl_UnloadObjCmd(
      *  - Its prefix and file match the once we're looking for.
      *  - Its file matches, and we weren't given a prefix.
      *  - Its prefix matches, the file name was specified as empty, and there is
-     *	  only no statically loaded library with the same prefix.
+     *	  no statically loaded library with the same prefix.
      */
 
     Tcl_MutexLock(&libraryMutex);
 
-    defaultPtr = NULL;
     for (libraryPtr = firstLibraryPtr; libraryPtr != NULL; libraryPtr = libraryPtr->nextPtr) {
 	int namesMatch, filesMatch;
 
@@ -677,9 +687,6 @@ Tcl_UnloadObjCmd(
 	if (filesMatch && (namesMatch || (prefix == NULL))) {
 	    break;
 	}
-	if (namesMatch && (fullFileName[0] == 0)) {
-	    defaultPtr = libraryPtr;
-	}
 	if (filesMatch && !namesMatch && (fullFileName[0] != 0)) {
 	    break;
 	}
@@ -741,6 +748,34 @@ Tcl_UnloadObjCmd(
 	goto done;
     }
 
+    code = UnloadLibrary(interp, target, libraryPtr, keepLibrary, fullFileName, 0);
+
+  done:
+    Tcl_DStringFree(&pfx);
+    Tcl_DStringFree(&tmp);
+    if (!complain && (code != TCL_OK)) {
+	code = TCL_OK;
+	Tcl_ResetResult(interp);
+    }
+    return code;
+}
+
+static int
+UnloadLibrary(
+	Tcl_Interp *interp,
+	Tcl_Interp *target,
+	LoadedLibrary *libraryPtr,
+	int keepLibrary,
+	const char *fullFileName,
+	int interpExiting
+)
+{
+    int code;
+    InterpLibrary *ipFirstPtr, *ipPtr;
+    LoadedLibrary *iterLibraryPtr;
+    int trustedRefCount = -1, safeRefCount = -1;
+    Tcl_LibraryUnloadProc *unloadProc = NULL;
+
     /*
      * Ensure that the DLL can be unloaded. If it is a trusted interpreter,
      * libraryPtr->unloadProc must not be NULL for the DLL to be unloadable. If
@@ -749,28 +784,34 @@ Tcl_UnloadObjCmd(
 
     if (Tcl_IsSafe(target)) {
 	if (libraryPtr->safeUnloadProc == NULL) {
-	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
-		    "file \"%s\" cannot be unloaded under a safe interpreter",
-		    fullFileName));
-	    Tcl_SetErrorCode(interp, "TCL", "OPERATION", "UNLOAD", "CANNOT",
-		    NULL);
-	    code = TCL_ERROR;
-	    goto done;
+	    if (!interpExiting) {
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"file \"%s\" cannot be unloaded under a safe interpreter",
+			fullFileName));
+		Tcl_SetErrorCode(interp, "TCL", "OPERATION", "UNLOAD", "CANNOT",
+			NULL);
+		code = TCL_ERROR;
+		goto done;
+	    }
 	}
 	unloadProc = libraryPtr->safeUnloadProc;
     } else {
 	if (libraryPtr->unloadProc == NULL) {
-	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
-		    "file \"%s\" cannot be unloaded under a trusted interpreter",
-		    fullFileName));
-	    Tcl_SetErrorCode(interp, "TCL", "OPERATION", "UNLOAD", "CANNOT",
-		    NULL);
-	    code = TCL_ERROR;
-	    goto done;
+	    if (!interpExiting) {
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"file \"%s\" cannot be unloaded under a trusted interpreter",
+			fullFileName));
+		Tcl_SetErrorCode(interp, "TCL", "OPERATION", "UNLOAD", "CANNOT",
+			NULL);
+		code = TCL_ERROR;
+		goto done;
+	    }
 	}
 	unloadProc = libraryPtr->unloadProc;
     }
 
+
+
     /*
      * We are ready to unload the library. First, evaluate the unload
      * function. If this fails, we cannot proceed with unload. Also, we must
@@ -781,34 +822,69 @@ Tcl_UnloadObjCmd(
      * after the callback returns, TCL_UNLOAD_DETACH_FROM_PROCESS is passed.
      */
 
-    code = TCL_UNLOAD_DETACH_FROM_INTERPRETER;
-    if (!keepLibrary) {
-	Tcl_MutexLock(&libraryMutex);
-	trustedRefCount = libraryPtr->interpRefCount;
-	safeRefCount = libraryPtr->safeInterpRefCount;
-	Tcl_MutexUnlock(&libraryMutex);
+    if (unloadProc == NULL) {
+	code = TCL_OK;
+    } else {
+	code = TCL_UNLOAD_DETACH_FROM_INTERPRETER;
+	if (!keepLibrary) {
+	    Tcl_MutexLock(&libraryMutex);
+	    trustedRefCount = libraryPtr->interpRefCount;
+	    safeRefCount = libraryPtr->safeInterpRefCount;
+	    Tcl_MutexUnlock(&libraryMutex);
 
-	if (Tcl_IsSafe(target)) {
-	    safeRefCount--;
-	} else {
-	    trustedRefCount--;
-	}
+	    if (Tcl_IsSafe(target)) {
+		safeRefCount--;
+	    } else {
+		trustedRefCount--;
+	    }
 
-	if (safeRefCount <= 0 && trustedRefCount <= 0) {
-	    code = TCL_UNLOAD_DETACH_FROM_PROCESS;
+	    if (safeRefCount <= 0 && trustedRefCount <= 0) {
+		code = TCL_UNLOAD_DETACH_FROM_PROCESS;
+	    }
 	}
+	code = unloadProc(target, code);
     }
-    code = unloadProc(target, code);
+
+
     if (code != TCL_OK) {
 	Tcl_TransferResult(target, code, interp);
 	goto done;
     }
 
+
+    /*
+     * Remove this library from the interpreter's library cache.
+     */
+
+    ipFirstPtr = (InterpLibrary *)Tcl_GetAssocData(target, "tclLoad", NULL);
+    ipPtr = ipFirstPtr;
+    if (ipPtr->libraryPtr == libraryPtr) {
+	ipFirstPtr = ipFirstPtr->nextPtr;
+    } else {
+	InterpLibrary *ipPrevPtr;
+
+	for (ipPrevPtr = ipPtr; ipPtr != NULL;
+		ipPrevPtr = ipPtr, ipPtr = ipPtr->nextPtr) {
+	    if (ipPtr->libraryPtr == libraryPtr) {
+		ipPrevPtr->nextPtr = ipPtr->nextPtr;
+		break;
+	    }
+	}
+    }
+    ckfree(ipPtr);
+    Tcl_SetAssocData(target, "tclLoad", LoadCleanupProc, ipFirstPtr);
+
+
+    if (IsStatic(libraryPtr)) {
+	goto done;
+    }
+
     /*
      * The unload function executed fine. Examine the reference count to see
      * if we unload the DLL.
      */
 
+
     Tcl_MutexLock(&libraryMutex);
     if (Tcl_IsSafe(target)) {
 	libraryPtr->safeInterpRefCount--;
@@ -850,51 +926,29 @@ Tcl_UnloadObjCmd(
 	 * it's been unloaded.
 	 */
 
-	if (libraryPtr->fileName[0] != '\0') {
+	if (!IsStatic(libraryPtr)) {
 	    Tcl_MutexLock(&libraryMutex);
 	    if (Tcl_FSUnloadFile(interp, libraryPtr->loadHandle) == TCL_OK) {
 		/*
 		 * Remove this library from the loaded library cache.
 		 */
 
-		defaultPtr = libraryPtr;
-		if (defaultPtr == firstLibraryPtr) {
+		iterLibraryPtr = libraryPtr;
+		if (iterLibraryPtr == firstLibraryPtr) {
 		    firstLibraryPtr = libraryPtr->nextPtr;
 		} else {
 		    for (libraryPtr = firstLibraryPtr; libraryPtr != NULL;
 			    libraryPtr = libraryPtr->nextPtr) {
-			if (libraryPtr->nextPtr == defaultPtr) {
-			    libraryPtr->nextPtr = defaultPtr->nextPtr;
+			if (libraryPtr->nextPtr == iterLibraryPtr) {
+			    libraryPtr->nextPtr = iterLibraryPtr->nextPtr;
 			    break;
 			}
 		    }
 		}
 
-		/*
-		 * Remove this library from the interpreter's library cache.
-		 */
-
-		ipFirstPtr = (InterpLibrary *)Tcl_GetAssocData(target, "tclLoad", NULL);
-		ipPtr = ipFirstPtr;
-		if (ipPtr->libraryPtr == defaultPtr) {
-		    ipFirstPtr = ipFirstPtr->nextPtr;
-		} else {
-		    InterpLibrary *ipPrevPtr;
-
-		    for (ipPrevPtr = ipPtr; ipPtr != NULL;
-			    ipPrevPtr = ipPtr, ipPtr = ipPtr->nextPtr) {
-			if (ipPtr->libraryPtr == defaultPtr) {
-			    ipPrevPtr->nextPtr = ipPtr->nextPtr;
-			    break;
-			}
-		    }
-		}
-		Tcl_SetAssocData(target, "tclLoad", LoadCleanupProc,
-			ipFirstPtr);
-		ckfree(defaultPtr->fileName);
-		ckfree(defaultPtr->prefix);
-		ckfree(defaultPtr);
-		ckfree(ipPtr);
+		ckfree(iterLibraryPtr->fileName);
+		ckfree(iterLibraryPtr->prefix);
+		ckfree(iterLibraryPtr);
 		Tcl_MutexUnlock(&libraryMutex);
 	    } else {
 		code = TCL_ERROR;
@@ -911,12 +965,6 @@ Tcl_UnloadObjCmd(
     }
 
   done:
-    Tcl_DStringFree(&pfx);
-    Tcl_DStringFree(&tmp);
-    if (!complain && (code != TCL_OK)) {
-	code = TCL_OK;
-	Tcl_ResetResult(interp);
-    }
     return code;
 }
 
@@ -989,6 +1037,8 @@ Tcl_StaticLibrary(
 	libraryPtr->loadHandle	= NULL;
 	libraryPtr->initProc	= initProc;
 	libraryPtr->safeInitProc	= safeInitProc;
+	libraryPtr->unloadProc = NULL;
+	libraryPtr->safeUnloadProc = NULL;
 	Tcl_MutexLock(&libraryMutex);
 	libraryPtr->nextPtr		= firstLibraryPtr;
 	firstLibraryPtr		= libraryPtr;
@@ -1137,17 +1187,20 @@ TclGetLoadedLibraries(
 
 static void
 LoadCleanupProc(
-    ClientData clientData,	/* Pointer to first InterpLibrary structure
+    TCL_UNUSED(ClientData),	/* Pointer to first InterpLibrary structure
 				 * for interp. */
-    TCL_UNUSED(Tcl_Interp *))
+    Tcl_Interp *interp)
 {
-    InterpLibrary *ipPtr, *nextPtr;
+    InterpLibrary *ipPtr;
+    LoadedLibrary *libraryPtr;
 
-    ipPtr = (InterpLibrary *)clientData;
-    while (ipPtr != NULL) {
-	nextPtr = ipPtr->nextPtr;
-	ckfree(ipPtr);
-	ipPtr = nextPtr;
+    while (1) {
+	ipPtr = (InterpLibrary *)Tcl_GetAssocData(interp, "tclLoad", NULL);
+	if (ipPtr == NULL) {
+	    break;
+	}
+	libraryPtr = ipPtr->libraryPtr;
+	UnloadLibrary(interp, interp, libraryPtr, 0 ,"", 1);
     }
 }
 
@@ -1192,7 +1245,7 @@ TclFinalizeLoad(void)
 	 * it has been unloaded.
 	 */
 
-	if (libraryPtr->fileName[0] != '\0') {
+	if (!IsStatic(libraryPtr)) {
 	    Tcl_FSUnloadFile(NULL, libraryPtr->loadHandle);
 	}
 #endif
diff --git a/generic/tclNamesp.c b/generic/tclNamesp.c
index f57b7e1..5dc9659 100644
--- a/generic/tclNamesp.c
+++ b/generic/tclNamesp.c
@@ -306,7 +306,7 @@ Tcl_PushCallFrame(
 
 	/*
 	 * TODO: Examine whether it would be better to guard based on NS_DYING
-	 * or NS_KILLED. It appears that these are not tested because they can
+	 * or NS_TEARDOWN. It appears that these are not tested because they can
 	 * be set in a global interp that has been [namespace delete]d, but
 	 * which never really completely goes away because of lingering global
 	 * things like ::errorInfo and [::unknown] and hidden commands.
@@ -986,20 +986,21 @@ Tcl_DeleteNamespace(
     }
 
     /*
-     * If the namespace is on the call frame stack, it is marked as "dying"
-     * (NS_DYING is OR'd into its flags): the namespace can't be looked up by
-     * name but its commands and variables are still usable by those active
-     * call frames. When all active call frames referring to the namespace
-     * have been popped from the Tcl stack, Tcl_PopCallFrame will call this
-     * function again to delete everything in the namespace. If no nsName
-     * objects refer to the namespace (i.e., if its refCount is zero), its
-     * commands and variables are deleted and the storage for its namespace
-     * structure is freed. Otherwise, if its refCount is nonzero, the
-     * namespace's commands and variables are deleted but the structure isn't
-     * freed. Instead, NS_DEAD is OR'd into the structure's flags to allow the
-     * namespace resolution code to recognize that the namespace is "deleted".
-     * The structure's storage is freed by FreeNsNameInternalRep when its
-     * refCount reaches 0.
+	 * If the namespace is on the call frame stack, it is marked as "dying"
+	 * (NS_DYING is OR'd into its flags):  Contents of the namespace are
+	 * still available and visible until the namespace is later marked as
+	 * NS_DEAD, and its commands and variables are still usable by any
+	 * active call frames referring to th namespace. When all active call
+	 * frames referring to the namespace have been popped from the Tcl
+	 * stack, Tcl_PopCallFrame calls Tcl_DeleteNamespace again. If no
+	 * nsName objects refer to the namespace (i.e., if its refCount is
+	 * zero), its commands and variables are deleted and the storage for
+	 * its namespace structure is freed.  Otherwise, if its refCount is
+	 * nonzero, the namespace's commands and variables are deleted but the
+	 * structure isn't freed. Instead, NS_DEAD is OR'd into the structure's
+	 * flags to allow the namespace resolution code to recognize that the
+	 * namespace is "deleted".  The structure's storage is freed by
+	 * FreeNsNameInternalRep when its refCount reaches 0.
      */
 
     if (nsPtr->activationCount - (nsPtr == globalNsPtr) > 0) {
@@ -1013,16 +1014,16 @@ Tcl_DeleteNamespace(
 	    }
 	}
 	nsPtr->parentPtr = NULL;
-    } else if (!(nsPtr->flags & NS_KILLED)) {
+    } else if (!(nsPtr->flags & NS_TEARDOWN)) {
 	/*
 	 * Delete the namespace and everything in it. If this is the global
 	 * namespace, then clear it but don't free its storage unless the
-	 * interpreter is being torn down. Set the NS_KILLED flag to avoid
+	 * interpreter is being torn down. Set the NS_TEARDOWN flag to avoid
 	 * recursive calls here - if the namespace is really in the process of
 	 * being deleted, ignore any second call.
 	 */
 
-	nsPtr->flags |= (NS_DYING|NS_KILLED);
+	nsPtr->flags |= (NS_DYING|NS_TEARDOWN);
 
 	TclTeardownNamespace(nsPtr);
 
@@ -1060,7 +1061,7 @@ Tcl_DeleteNamespace(
 	     * get killed later, avoiding mem leaks.
 	     */
 
-	    nsPtr->flags &= ~(NS_DYING|NS_KILLED);
+	    nsPtr->flags &= ~(NS_DYING|NS_TEARDOWN);
 	}
     }
     TclNsDecrRefCount(nsPtr);
@@ -1073,6 +1074,83 @@ TclNamespaceDeleted(
     return (nsPtr->flags & NS_DYING) ? 1 : 0;
 }
 
+void
+TclDeleteNamespaceChildren(
+    Namespace *nsPtr	/* Namespace whose children to delete */
+)
+{
+    Interp *iPtr = (Interp *) nsPtr->interp;
+    Tcl_HashEntry *entryPtr;
+    int i, unchecked;
+    Tcl_HashSearch search;
+    /*
+     * Delete all the child namespaces.
+     *
+     * BE CAREFUL: When each child is deleted, it divorces itself from its
+     * parent.  The hash table can't be proplery traversed if its elements are
+     * being deleted.  Because of traces (and the desire to avoid the
+     * quadratic problems of just using Tcl_FirstHashEntry over and over, [Bug
+     * f97d4ee020]) copy to a temporary array and then delete all those
+     * namespaces.
+     *
+     * Important: leave the hash table itself still live.
+     */
+
+#ifndef BREAK_NAMESPACE_COMPAT
+    unchecked = (nsPtr->childTable.numEntries > 0);
+    while (nsPtr->childTable.numEntries > 0 && unchecked) {
+	int length = nsPtr->childTable.numEntries;
+	Namespace **children = (Namespace **)TclStackAlloc((Tcl_Interp *) iPtr,
+		sizeof(Namespace *) * length);
+
+	i = 0;
+	for (entryPtr = Tcl_FirstHashEntry(&nsPtr->childTable, &search);
+		entryPtr != NULL;
+		entryPtr = Tcl_NextHashEntry(&search)) {
+	    children[i] = (Namespace *)Tcl_GetHashValue(entryPtr);
+	    children[i]->refCount++;
+	    i++;
+	}
+	unchecked = 0;
+	for (i = 0 ; i < length ; i++) {
+	    if (!(children[i]->flags & NS_DYING)) {
+		unchecked = 1;
+		Tcl_DeleteNamespace((Tcl_Namespace *) children[i]);
+		TclNsDecrRefCount(children[i]);
+	    }
+	}
+	TclStackFree((Tcl_Interp *) iPtr, children);
+    }
+#else
+    if (nsPtr->childTablePtr != NULL) {
+	unchecked = (nsPtr->childTable.numEntries > 0);
+	while (nsPtr->childTable.numEntries > 0 && unchecked) {
+	    int length = nsPtr->childTablePtr->numEntries;
+	    Namespace **children = (Namespace **)TclStackAlloc((Tcl_Interp *) iPtr,
+		    sizeof(Namespace *) * length);
+
+	    i = 0;
+	    for (entryPtr = Tcl_FirstHashEntry(nsPtr->childTablePtr, &search);
+		    entryPtr != NULL;
+		    entryPtr = Tcl_NextHashEntry(&search)) {
+		children[i] = (Namespace *)Tcl_GetHashValue(entryPtr);
+		children[i]->refCount++;
+		i++;
+	    }
+	    unchecked = 0;
+	    for (i = 0 ; i < length ; i++) {
+		if (!(children[i]->flags & NS_DYING)) {
+		    unchecked = 1;
+		    Tcl_DeleteNamespace((Tcl_Namespace *) children[i]);
+		    TclNsDecrRefCount(children[i]);
+		}
+	    }
+	    TclStackFree((Tcl_Interp *) iPtr, children);
+	}
+    }
+#endif
+}
+
 /*
  *----------------------------------------------------------------------
  *
@@ -1181,62 +1259,7 @@ TclTeardownNamespace(
 	nsPtr->commandPathSourceList = NULL;
     }
 
-    /*
-     * Delete all the child namespaces.
-     *
-     * BE CAREFUL: When each child is deleted, it will divorce itself from its
-     * parent. You can't traverse a hash table properly if its elements are
-     * being deleted.  Because of traces (and the desire to avoid the
-     * quadratic problems of just using Tcl_FirstHashEntry over and over, [Bug
-     * f97d4ee020]) we copy to a temporary array and then delete all those
-     * namespaces.
-     *
-     * Important: leave the hash table itself still live.
-     */
-
-#ifndef BREAK_NAMESPACE_COMPAT
-    while (nsPtr->childTable.numEntries > 0) {
-	int length = nsPtr->childTable.numEntries;
-	Namespace **children = (Namespace **)TclStackAlloc((Tcl_Interp *) iPtr,
-		sizeof(Namespace *) * length);
-
-	i = 0;
-	for (entryPtr = Tcl_FirstHashEntry(&nsPtr->childTable, &search);
-		entryPtr != NULL;
-		entryPtr = Tcl_NextHashEntry(&search)) {
-	    children[i] = (Namespace *)Tcl_GetHashValue(entryPtr);
-	    children[i]->refCount++;
-	    i++;
-	}
-	for (i = 0 ; i < length ; i++) {
-	    Tcl_DeleteNamespace((Tcl_Namespace *) children[i]);
-	    TclNsDecrRefCount(children[i]);
-	}
-	TclStackFree((Tcl_Interp *) iPtr, children);
-    }
-#else
-    if (nsPtr->childTablePtr != NULL) {
-	while (nsPtr->childTablePtr->numEntries > 0) {
-	    int length = nsPtr->childTablePtr->numEntries;
-	    Namespace **children = (Namespace **)TclStackAlloc((Tcl_Interp *) iPtr,
-		    sizeof(Namespace *) * length);
-
-	    i = 0;
-	    for (entryPtr = Tcl_FirstHashEntry(nsPtr->childTablePtr, &search);
-		    entryPtr != NULL;
-		    entryPtr = Tcl_NextHashEntry(&search)) {
-		children[i] = Tcl_GetHashValue(entryPtr);
-		children[i]->refCount++;
-		i++;
-	    }
-	    for (i = 0 ; i < length ; i++) {
-		Tcl_DeleteNamespace((Tcl_Namespace *) children[i]);
-		TclNsDecrRefCount(children[i]);
-	    }
-	    TclStackFree((Tcl_Interp *) iPtr, children);
-	}
-    }
-#endif
+    TclDeleteNamespaceChildren(nsPtr);
 
     /*
      * Free the namespace's export pattern array.
@@ -2618,7 +2641,7 @@ Tcl_FindCommand(
 		&simpleName);
 	if ((realNsPtr != NULL) && (simpleName != NULL)) {
 	    if ((cxtNsPtr == realNsPtr)
-		    || !(realNsPtr->flags & NS_DYING)) {
+		    || !(realNsPtr->flags & NS_DEAD)) {
 		entryPtr = Tcl_FindHashEntry(&realNsPtr->cmdTable, simpleName);
 		if (entryPtr != NULL) {
 		    cmdPtr = (Command *)Tcl_GetHashValue(entryPtr);
@@ -2630,7 +2653,7 @@ Tcl_FindCommand(
 	 * Next, check along the path.
 	 */
 
-	for (i=0 ; i<cxtNsPtr->commandPathLength && cmdPtr==NULL ; i++) {
+	for (i=0 ; (cmdPtr == NULL) && i<cxtNsPtr->commandPathLength ; i++) {
 	    pathNsPtr = cxtNsPtr->commandPathArray[i].nsPtr;
 	    if (pathNsPtr == NULL) {
 		continue;
@@ -2639,7 +2662,7 @@ Tcl_FindCommand(
 		    TCL_NAMESPACE_ONLY, &realNsPtr, &dummyNsPtr, &dummyNsPtr,
 		    &simpleName);
 	    if ((realNsPtr != NULL) && (simpleName != NULL)
-		    && !(realNsPtr->flags & NS_DYING)) {
+		    && !(realNsPtr->flags & NS_DEAD)) {
 		entryPtr = Tcl_FindHashEntry(&realNsPtr->cmdTable, simpleName);
 		if (entryPtr != NULL) {
 		    cmdPtr = (Command *)Tcl_GetHashValue(entryPtr);
@@ -2657,7 +2680,7 @@ Tcl_FindCommand(
 		    TCL_GLOBAL_ONLY, &realNsPtr, &dummyNsPtr, &dummyNsPtr,
 		    &simpleName);
 	    if ((realNsPtr != NULL) && (simpleName != NULL)
-		    && !(realNsPtr->flags & NS_DYING)) {
+		    && !(realNsPtr->flags & NS_DEAD)) {
 		entryPtr = Tcl_FindHashEntry(&realNsPtr->cmdTable, simpleName);
 		if (entryPtr != NULL) {
 		    cmdPtr = (Command *)Tcl_GetHashValue(entryPtr);
@@ -3277,7 +3300,7 @@ NamespaceDeleteCmd(
 	name = TclGetString(objv[i]);
 	namespacePtr = Tcl_FindNamespace(interp, name, NULL, /*flags*/ 0);
 	if ((namespacePtr == NULL)
-		|| (((Namespace *) namespacePtr)->flags & NS_KILLED)) {
+		|| (((Namespace *) namespacePtr)->flags & NS_TEARDOWN)) {
 	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
                     "unknown namespace \"%s\" in namespace delete command",
 		    TclGetString(objv[i])));
diff --git a/generic/tclPosixStr.c b/generic/tclPosixStr.c
index d91a9c4..ecdf652 100644
--- a/generic/tclPosixStr.c
+++ b/generic/tclPosixStr.c
@@ -158,6 +158,9 @@ Tcl_ErrnoId(void)
 #ifdef EINIT
     case EINIT: return "EINIT";
 #endif
+#ifdef EILSEQ
+    case EILSEQ: return "EILSEQ";
+#endif
 #ifdef EINPROGRESS
     case EINPROGRESS: return "EINPROGRESS";
 #endif
@@ -617,6 +620,9 @@ Tcl_ErrnoMsg(
 #ifdef EINIT
     case EINIT: return "initialization error";
 #endif
+#ifdef EILSEQ
+    case EILSEQ: return "illegal byte sequence";
+#endif
 #ifdef EINPROGRESS
     case EINPROGRESS: return "operation now in progress";
 #endif
diff --git a/generic/tclStubInit.c b/generic/tclStubInit.c
index 01d9275..5028916 100644
--- a/generic/tclStubInit.c
+++ b/generic/tclStubInit.c
@@ -1941,6 +1941,7 @@ const TclStubs tclStubs = {
     Tcl_UtfCharComplete, /* 654 */
     Tcl_UtfNext, /* 655 */
     Tcl_UtfPrev, /* 656 */
+    Tcl_UniCharIsUnicode, /* 657 */
 };
 
 /* !END!: Do not edit above this line. */
diff --git a/generic/tclTestObj.c b/generic/tclTestObj.c
index 17546a4..f766030 100644
--- a/generic/tclTestObj.c
+++ b/generic/tclTestObj.c
@@ -54,14 +54,13 @@ static Tcl_ObjCmdProc	TeststringobjCmd;
 #define VARPTR_KEY "TCLOBJTEST_VARPTR"
 #define NUMBER_OF_OBJECT_VARS 20
 
-static void VarPtrDeleteProc(void *clientData, Tcl_Interp *interp)
+static void VarPtrDeleteProc(void *clientData, TCL_UNUSED(Tcl_Interp *))
 {
     int i;
     Tcl_Obj **varPtr = (Tcl_Obj **) clientData;
     for (i = 0;  i < NUMBER_OF_OBJECT_VARS;  i++) {
 	if (varPtr[i]) Tcl_DecrRefCount(varPtr[i]);
     }
-    Tcl_DeleteAssocData(interp, VARPTR_KEY);
     ckfree(varPtr);
 }
 
diff --git a/generic/tclUtf.c b/generic/tclUtf.c
index 28f725a..fcdf80a 100644
--- a/generic/tclUtf.c
+++ b/generic/tclUtf.c
@@ -2182,6 +2182,36 @@ Tcl_UniCharIsUpper(
 /*
  *----------------------------------------------------------------------
  *
+ * Tcl_UniCharIsUnicode --
+ *
+ *	Test if a character is a Unicode character.
+ *
+ * Results:
+ *	Returns non-zero if character belongs to the Unicode set.
+ *
+ *	Excluded are:
+ *	  1) All characters > U+10FFFF
+ *	  2) Surrogates U+D800 - U+DFFF
+ *	  3) Last 2 characters of each plane, so U+??FFFE  and U+??FFFF
+ *	  4) The characters in the range U+FDD0 - U+FDEF
+ *
+ * Side effects:
+ *	None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+int
+Tcl_UniCharIsUnicode(
+    int ch)			/* Unicode character to test. */
+{
+    return ((unsigned int)ch <= 0x10FFFF) && ((ch & 0xFFF800) != 0xD800)
+	    && ((ch & 0xFFFE) != 0xFFFE) && ((unsigned int)(ch - 0xFDD0) >= 32);
+}
+
+/*
+ *----------------------------------------------------------------------
+ *
  * Tcl_UniCharIsWordChar --
  *
  *	Test if a character is alphanumeric or a connector punctuation mark.
diff --git a/generic/tclZipfs.c b/generic/tclZipfs.c
index de74fb3..dbb4cd9 100644
--- a/generic/tclZipfs.c
+++ b/generic/tclZipfs.c
@@ -249,7 +249,7 @@ typedef struct ZipChannel {
  * Most are kept in single ZipFS struct. When build with threading support
  * this struct is protected by the ZipFSMutex (see below).
  *
- * The "fileHash" component is the process wide global table of all known ZIP
+ * The "fileHash" component is the process-wide global table of all known ZIP
  * archive members in all mounted ZIP archives.
  *
  * The "zipHash" components is the process wide global table of all mounted
@@ -346,7 +346,9 @@ static int		ZipFSLoadFile(Tcl_Interp *interp, Tcl_Obj *path,
 static int		ZipMapArchive(Tcl_Interp *interp, ZipFile *zf,
 			    void *handle);
 static void		ZipfsExitHandler(ClientData clientData);
+static void		ZipfsMountExitHandler(ClientData clientData);
 static void		ZipfsSetup(void);
+static void		ZipfsFinalize(void);
 static int		ZipChannelClose(void *instanceData,
 			    Tcl_Interp *interp, int flags);
 static Tcl_DriverGetHandleProc	ZipChannelGetFile;
@@ -1613,7 +1615,7 @@ ZipFSCatalogFilesystem(
      */
 
     zf->mountPoint = (char *) Tcl_GetHashKey(&ZipFS.zipHash, hPtr);
-    Tcl_CreateExitHandler(ZipfsExitHandler, zf);
+    Tcl_CreateExitHandler(ZipfsMountExitHandler, zf);
     zf->mountPointLen = strlen(zf->mountPoint);
 
     zf->nameLength = strlen(zipname);
@@ -1855,6 +1857,7 @@ ZipfsSetup(void)
     strcpy(ZipFS.fallbackEntryEncoding, ZIPFS_FALLBACK_ENCODING);
     ZipFS.utf8 = Tcl_GetEncoding(NULL, "utf-8");
     ZipFS.initialized = 1;
+    Tcl_CreateExitHandler(ZipfsExitHandler, NULL);
 }
 
 /*
@@ -2178,7 +2181,7 @@ TclZipfs_Unmount(
 	ckfree(z);
     }
     ZipFSCloseArchive(interp, zf);
-    Tcl_DeleteExitHandler(ZipfsExitHandler, zf);
+    Tcl_DeleteExitHandler(ZipfsMountExitHandler, zf);
     ckfree(zf);
     unmounted = 1;
 
@@ -5730,13 +5733,48 @@ ZipfsAppHookFindTclInit(
 
 static void
 ZipfsExitHandler(
+    TCL_UNUSED(ClientData)
+)
+{
+    Tcl_HashEntry *hPtr;
+    Tcl_HashSearch search;
+    if (ZipFS.initialized != -1) {
+	hPtr = Tcl_FirstHashEntry(&ZipFS.fileHash, &search);
+	if (hPtr == NULL) {
+	    ZipfsFinalize();
+	} else {
+	    /* ZipFS.fallbackEntryEncoding was already freed by
+	     * ZipfsMountExitHandler
+	    */
+	}
+    }
+}
+
+static void
+ZipfsFinalize(void) {
+    Tcl_DeleteHashTable(&ZipFS.fileHash);
+    ckfree(ZipFS.fallbackEntryEncoding);
+    ZipFS.initialized = -1;
+}
+
+static void
+ZipfsMountExitHandler(
     ClientData clientData)
 {
+    Tcl_HashEntry *hPtr;
+    Tcl_HashSearch search;
+
     ZipFile *zf = (ZipFile *) clientData;
 
     if (TCL_OK != TclZipfs_Unmount(NULL, zf->mountPoint)) {
 	Tcl_Panic("tried to unmount busy filesystem");
     }
+
+    hPtr = Tcl_FirstHashEntry(&ZipFS.fileHash, &search);
+    if (hPtr == NULL) {
+	ZipfsFinalize();
+    }
+
 }
 
 /*
diff --git a/library/init.tcl b/library/init.tcl
index c9bfff6..e30296e 100644
--- a/library/init.tcl
+++ b/library/init.tcl
@@ -214,9 +214,9 @@ proc unknown args {
 		set errInfo [dict get $opts -errorinfo]
 		set errCode [dict get $opts -errorcode]
 		set cinfo $args
-		if {[string bytelength $cinfo] > 150} {
+		if {[string length [encoding convertto utf-8 $cinfo]] > 150} {
 		    set cinfo [string range $cinfo 0 150]
-		    while {[string bytelength $cinfo] > 150} {
+		    while {[string length [encoding convertto utf-8 $cinfo]] > 150} {
 			set cinfo [string range $cinfo 0 end-1]
 		    }
 		    append cinfo ...
diff --git a/tests/chanio.test b/tests/chanio.test
index 8dfefb7..53e8020 100644
--- a/tests/chanio.test
+++ b/tests/chanio.test
@@ -7518,7 +7518,7 @@ test chan-io-60.1 {writing illegal utf sequences} {fileevent testbytestring} {
     # cut of the remainder of the error stack, especially the filename
     set result [lreplace $result 3 3 [lindex [split [lindex $result 3] \n] 0]]
     list $x $result
-} {1 {gets {} catch {error writing "stdout": invalid argument}}}
+} {1 {gets {} catch {error writing "stdout": illegal byte sequence}}}
 
 test chan-io-61.1 {Reset eof state after changing the eof char} -setup {
     set datafile [makeFile {} eofchar]
diff --git a/tests/encoding.test b/tests/encoding.test
index c8daed6..0e80c09 100644
--- a/tests/encoding.test
+++ b/tests/encoding.test
@@ -343,61 +343,61 @@ test encoding-15.6 {UtfToUtfProc emoji character output} {
     set y [encoding convertto utf-8 \uDE02\uD83D\uDE02\uD83D]
     binary scan $y H* z
     list [string length $y] $z
-} {10 edb882f09f9882eda0bd}
+} {10 efbfbdf09f9882efbfbd}
 test encoding-15.7 {UtfToUtfProc emoji character output} {
     set x \uDE02\uD83D\uD83D
     set y [encoding convertto utf-8 \uDE02\uD83D\uD83D]
     binary scan $y H* z
     list [string length $x] [string length $y] $z
-} {3 9 edb882eda0bdeda0bd}
+} {3 9 efbfbdefbfbdefbfbd}
 test encoding-15.8 {UtfToUtfProc emoji character output} {
     set x \uDE02\uD83Dé
     set y [encoding convertto utf-8 \uDE02\uD83Dé]
     binary scan $y H* z
     list [string length $x] [string length $y] $z
-} {3 8 edb882eda0bdc3a9}
+} {3 8 efbfbdefbfbdc3a9}
 test encoding-15.9 {UtfToUtfProc emoji character output} {
     set x \uDE02\uD83DX
     set y [encoding convertto utf-8 \uDE02\uD83DX]
     binary scan $y H* z
     list [string length $x] [string length $y] $z
-} {3 7 edb882eda0bd58}
+} {3 7 efbfbdefbfbd58}
 test encoding-15.10 {UtfToUtfProc high surrogate character output} {
     set x \uDE02é
     set y [encoding convertto utf-8 \uDE02é]
     binary scan $y H* z
     list [string length $x] [string length $y] $z
-} {2 5 edb882c3a9}
+} {2 5 efbfbdc3a9}
 test encoding-15.11 {UtfToUtfProc low surrogate character output} {
     set x \uDA02é
     set y [encoding convertto utf-8 \uDA02é]
     binary scan $y H* z
     list [string length $x] [string length $y] $z
-} {2 5 eda882c3a9}
+} {2 5 efbfbdc3a9}
 test encoding-15.12 {UtfToUtfProc high surrogate character output} {
     set x \uDE02Y
     set y [encoding convertto utf-8 \uDE02Y]
     binary scan $y H* z
     list [string length $x] [string length $y] $z
-} {2 4 edb88259}
+} {2 4 efbfbd59}
 test encoding-15.13 {UtfToUtfProc low surrogate character output} {
     set x \uDA02Y
     set y [encoding convertto utf-8 \uDA02Y]
     binary scan $y H* z
     list [string length $x] [string length $y] $z
-} {2 4 eda88259}
+} {2 4 efbfbd59}
 test encoding-15.14 {UtfToUtfProc high surrogate character output} {
     set x \uDE02
     set y [encoding convertto utf-8 \uDE02]
     binary scan $y H* z
     list [string length $x] [string length $y] $z
-} {1 3 edb882}
+} {1 3 efbfbd}
 test encoding-15.15 {UtfToUtfProc low surrogate character output} {
     set x \uDA02
     set y [encoding convertto utf-8 \uDA02]
     binary scan $y H* z
     list [string length $x] [string length $y] $z
-} {1 3 eda882}
+} {1 3 efbfbd}
 test encoding-15.16 {UtfToUtfProc: Invalid 4-byte UTF-8, see [ed29806ba]} {
     set x \xF0\xA0\xA1\xC2
     set y [encoding convertfrom utf-8 \xF0\xA0\xA1\xC2]
@@ -409,6 +409,26 @@ test encoding-15.17 {UtfToUtfProc emoji character output} {
     binary scan $y H* z
     list [string length $y] $z
 } {4 f09f9882}
+test encoding-15.18 {UtfToUtfProc CESU-8 6-byte sequence} {
+    set y [encoding convertto cesu-8 \U10000]
+    binary scan $y H* z
+    list [string length $y] $z
+} {6 eda080edb080}
+test encoding-15.19 {UtfToUtfProc CESU-8 upper surrogate} {
+    set y [encoding convertto cesu-8 \uD800]
+    binary scan $y H* z
+    list [string length $y] $z
+} {3 eda080}
+test encoding-15.20 {UtfToUtfProc CESU-8 lower surrogate} {
+    set y [encoding convertto cesu-8 \uDC00]
+    binary scan $y H* z
+    list [string length $y] $z
+} {3 edb080}
+test encoding-15.21 {UtfToUtfProc CESU-8 noncharacter} {
+    set y [encoding convertto cesu-8 \uFFFF]
+    binary scan $y H* z
+    list [string length $y] $z
+} {3 efbfbf}
 
 test encoding-16.1 {Utf16ToUtfProc} -body {
     set val [encoding convertfrom utf-16 NN]
@@ -434,15 +454,15 @@ test encoding-16.4 {Ucs2ToUtfProc} -body {
 test encoding-17.1 {UtfToUtf16Proc} -body {
     encoding convertto utf-16 "\U460DC"
 } -result "\xD8\xD8\xDC\xDC"
-test encoding-17.2 {UtfToUtf16Proc} -body {
-    encoding convertto utf-16 "\uDCDC"
-} -result "\xDC\xDC"
-test encoding-17.3 {UtfToUtf16Proc} -body {
-    encoding convertto utf-16 "\uD8D8"
-} -result "\xD8\xD8"
-test encoding-17.4 {UtfToUcs2Proc} -body {
+test encoding-17.2 {UtfToUcs2Proc} -body {
     encoding convertfrom utf-16 [encoding convertto ucs-2 "\U460DC"]
 } -result "\uFFFD"
+test encoding-17.3 {UtfToUtf16Proc} -body {
+    encoding convertto utf-16be "\uDCDC"
+} -result "\xFF\xFD"
+test encoding-17.4 {UtfToUtf16Proc} -body {
+    encoding convertto utf-16le "\uD8D8"
+} -result "\xFD\xFF"
 
 test encoding-18.1 {TableToUtfProc} {
 } {}
@@ -742,7 +762,7 @@ test encoding-28.0 {all encodings load} -body {
 		llength $name
 	}
 	return $count
-} -result [expr {[info exists ::tcl_precision] ? 86 : 85}]
+} -result [expr {[info exists ::tcl_precision] ? 87 : 86}]
 
 runtests
 
diff --git a/tests/info.test b/tests/info.test
index d9a4f54..ced4435 100644
--- a/tests/info.test
+++ b/tests/info.test
@@ -22,7 +22,7 @@ if {{::tcltest} ni [namespace children]} {
 ::tcltest::loadTestedCommands
 catch [list package require -exact tcl::test [info patchlevel]]
 testConstraint zlib [llength [info commands zlib]]
-
+testConstraint nodep [info exists tcl_precision]
 # Set up namespaces needed to test operation of "info args", "info body",
 # "info default", and "info procs" with imported procedures.
 
@@ -101,7 +101,7 @@ test info-2.5 {info body option, returning bytecompiled bodies} -body {
 # Fix for problem tested for in info-2.5 caused problems when
 # procedure body had no string rep (i.e. was not yet bytecode)
 # causing an empty string to be returned [Bug #545644]
-test info-2.6 {info body option, returning list bodies} {
+test info-2.6 {info body option, returning list bodies} nodep {
     proc foo args [list subst bar]
     list [string bytelength [info body foo]] \
 	    [foo; string bytelength [info body foo]]
diff --git a/tests/io.test b/tests/io.test
index ddf2403..e26c97f 100644
--- a/tests/io.test
+++ b/tests/io.test
@@ -2416,7 +2416,7 @@ test io-28.7 {
 		blocking - finalize {
 		}
 		watch {
-		    chan postevent $chan read 
+		    chan postevent $chan read
 		}
 		initialize {
 		    list initialize finalize watch read write configure blocking
@@ -2437,7 +2437,7 @@ test io-28.7 {
     } [namespace current]]]
     vwait [namespace current]::done
 return success
-} success 
+} success
 
 
 
@@ -8478,7 +8478,7 @@ test io-60.1 {writing illegal utf sequences} {fileevent testbytestring} {
     # cut of the remainder of the error stack, especially the filename
     set result [lreplace $result 3 3 [lindex [split [lindex $result 3] \n] 0]]
     list $x $result
-} {1 {gets {} catch {error writing "stdout": invalid argument}}}
+} {1 {gets {} catch {error writing "stdout": illegal byte sequence}}}
 
 test io-61.1 {Reset eof state after changing the eof char} -setup {
     set datafile [makeFile {} eofchar]
diff --git a/tests/namespace.test b/tests/namespace.test
index efd00a8..6eabf61 100644
--- a/tests/namespace.test
+++ b/tests/namespace.test
@@ -182,8 +182,8 @@ test namespace-7.6 {recursive Tcl_DeleteNamespace, no active call frames in ns}
 } {}
 test namespace-7.7 {Bug 1655305} -setup {
     interp create child
-    # Can't invoke through the ensemble, since deleting the global namespace
-    # (indirectly, via deleting ::tcl) deletes the ensemble.
+    # Can't invoke through the ensemble, since deleting ::tcl
+    # (indirectly, via deleting the global namespace) deletes the ensemble.
     child eval {rename ::tcl::info::commands ::infocommands}
     child hide infocommands
     child eval {
@@ -207,10 +207,72 @@ test namespace-7.8 {Bug ba1419303b4c} -setup {
 	namespace delete ns1
     }
 } -body {
-    # No segmentation fault given --enable-symbols=mem.
+    # No segmentation fault given --enable-symbols.
     namespace delete ns1
 } -result {}
 
+
+test namespace-7.9 {
+	Bug e39cb3f462631a99
+
+	A namespace being deleted should not be removed from other namespace paths
+	until the contents of the namespace are entirely removed.
+} -setup {
+
+
+
+
+} -body {
+
+	variable res {}
+
+
+	namespace eval ns1 {
+		proc p1 caller {
+			lappend [namespace parent]::res $caller
+		}
+	}
+
+
+	namespace eval ns1a {
+		namespace path [namespace parent]::ns1
+
+		proc t1 {old new op} {
+			$old t1
+		}
+	}
+
+	namespace eval ns2 {
+		proc p1 caller {
+			lappend [namespace parent]::res $caller
+		}
+	}
+
+	namespace eval ns2a {
+		namespace path [namespace parent]::ns2
+
+		proc t1 {old new op} {
+			[namespace tail $old] t2
+		}
+	}
+
+
+	trace add command ns1::p1 delete ns1a::t1
+	namespace delete ns1
+
+	trace add command ns2::p1 delete ns2a::t1
+	namespace delete ns2
+
+	return $res
+
+} -cleanup {
+	namespace delete ns1a
+	namespace delete ns2a
+	unset res
+} -result {t1 t2}
+
+
+
 test namespace-8.1 {TclTeardownNamespace, delete global namespace} {
     catch {interp delete test_interp}
     interp create test_interp
@@ -2723,7 +2785,11 @@ test namespace-51.12 {name resolution path control} -body {
     catch {namespace delete ::test_ns_3}
     catch {namespace delete ::test_ns_4}
 }
-test namespace-51.13 {name resolution path control} -body {
+test namespace-51.13 {
+    name resolution path control
+    when the trace fires, ns_2 is being deleted but isn't gone yet, and is
+    still visible for the trace
+} -body {
     set ::result {}
     namespace eval ::test_ns_1 {
 	proc foo {} {lappend ::result 1}
@@ -2746,8 +2812,7 @@ test namespace-51.13 {name resolution path control} -body {
 	}
 	bar
     }
-    # Should the result be "2 {} {2 3 2 1}" instead?
-} -result {2 {} {2 3 1 1}} -cleanup {
+} -result {2 {} {2 3 2 1}} -cleanup {
     catch {namespace delete ::test_ns_1}
     catch {namespace delete ::test_ns_2}
     catch {namespace delete ::test_ns_3}
@@ -3340,6 +3405,43 @@ test namespace-56.5 {Bug 8b9854c3d8} -setup {
 } -result 1
 
 
+test namespace-56.6 {
+	Namespace deletion traces on both the original routine and the imported
+	routine should run without any memory error under a debug build.
+} -body {
+	variable res {}
+
+	proc ondelete {old new op} {
+	    variable res
+	    set tail [namespace tail $old]
+	    set up [namespace tail [namespace qualifiers $old]]
+	    lappend res [list $up $tail]
+	}
+
+
+	namespace eval ns1 {} {
+		namespace export *
+		proc p1 {} {
+			namespace upvar [namespace parent] res res
+			incr res
+		}
+		trace add command p1 delete ondelete
+	}
+
+	namespace eval ns2 {} {
+		namespace import [namespace parent]::ns1::p1
+		trace add command p1 delete ondelete
+	}
+
+	namespace delete ns1
+	namespace delete ns2
+	after 1
+	return $res
+} -cleanup {
+	unset res
+	rename ondelete {}
+} -result {{ns1 p1} {ns2 p1}}
+
 
 test namespace-57.0 {
     an imported alias should be usable in the deletion trace for the alias
diff --git a/tests/pkgMkIndex.test b/tests/pkgMkIndex.test
index df49c32..62bd3d4 100644
--- a/tests/pkgMkIndex.test
+++ b/tests/pkgMkIndex.test
@@ -577,19 +577,21 @@ test pkgMkIndex-10.1 {package in DLL and script} [list exec $dll] {
     exec [interpreter] << $cmd
     pkgtest::runCreatedIndex {0 {}} -lazy $fullPkgPath pkga[info sharedlibextension] pkga.tcl
 } "0 {{pkga:1.0 {tclPkgSetup {pkga[info sharedlibextension] load {pkga_eq pkga_quote}} {pkga.tcl source pkga_neq}}}}"
+
 test pkgMkIndex-10.2 {package in DLL hidden by -load} [list exec $dll] {
     # Do all [load]ing of shared libraries in another process, so we can
     # delete the file and not get stuck because we're holding a reference to
     # it.
     #
     # This test depends on context from prior test, so repeat it.
+
     set script \
 	"[list pkg_mkIndex -lazy $fullPkgPath [file tail $x] pkga.tcl]"
     append script \n \
 	"[list pkg_mkIndex -lazy -load Pkg* $fullPkgPath [file tail $x]]"
     exec [interpreter] << $script
     pkgtest::runCreatedIndex {0 {}} -lazy -load Pkg* -- $fullPkgPath pkga[info sharedlibextension]
-} {0 {}}
+} "0 {{pkga:1.0 {tclPkgSetup {pkga[info sharedlibextension] load {pkga_eq pkga_quote}}}}}"
 
 if {[testConstraint $dll]} {
     file delete -force [file join $fullPkgPath [file tail $x]]
diff --git a/tests/regexp.test b/tests/regexp.test
index e788b7f..6bed21e 100644
--- a/tests/regexp.test
+++ b/tests/regexp.test
@@ -19,6 +19,7 @@ if {"::tcltest" ni [namespace children]} {
 unset -nocomplain foo
 
 testConstraint exec [llength [info commands exec]]
+testConstraint nodep [info exists tcl_precision]
 
 # Used for constraining memory leak tests
 testConstraint memory [llength [info commands memory]]
@@ -765,7 +766,7 @@ test regexp-19.2 {regsub null replacement} {
     string equal $result $expected
 } 1
 
-test regexp-20.1 {regsub shared object shimmering} -body {
+test regexp-20.1 {regsub shared object shimmering} -constraints nodep -body {
     # Bug #461322
     set a abcdefghijklmnopqurstuvwxyz
     set b $a
diff --git a/tests/regexpComp.test b/tests/regexpComp.test
index 76e708d..1587c72 100644
--- a/tests/regexpComp.test
+++ b/tests/regexpComp.test
@@ -16,6 +16,8 @@ if {"::tcltest" ni [namespace children]} {
     namespace import -force ::tcltest::*
 }
 
+testConstraint nodep [info exists tcl_precision]
+
 # Procedure to evaluate a script within a proc, to test compilation
 # functionality
 
@@ -791,7 +793,7 @@ test regexpComp-19.1 {regsub null replacement} {
     }
 } "\0a\0hel\0a\0lo\0a\0 14"
 
-test regexpComp-20.1 {regsub shared object shimmering} {
+test regexpComp-20.1 {regsub shared object shimmering} nodep {
     evalInProc {
 	# Bug #461322
 	set a abcdefghijklmnopqurstuvwxyz
diff --git a/tests/string.test b/tests/string.test
index c2d47d3..822899c 100644
--- a/tests/string.test
+++ b/tests/string.test
@@ -33,6 +33,7 @@ testConstraint testindexobj [expr {[info commands testindexobj] ne {}}]
 testConstraint testevalex [expr {[info commands testevalex] ne {}}]
 testConstraint utf16 [expr {[string length \U010000] == 2}]
 testConstraint testbytestring   [llength [info commands testbytestring]]
+testConstraint nodep [info exists tcl_precision]
 
 # Used for constraining memory leak tests
 testConstraint memory [llength [info commands memory]]
@@ -72,9 +73,9 @@ if {$noComp} {
 }
 
 
-test string-1.1.$noComp {error conditions} {
+test string-1.1.$noComp {error conditions} -body {
     list [catch {run {string gorp a b}} msg] $msg
-} {1 {unknown or ambiguous subcommand "gorp": must be bytelength, cat, compare, equal, first, index, insert, is, last, length, map, match, range, repeat, replace, reverse, tolower, totitle, toupper, trim, trimleft, trimright, wordend, or wordstart}}
+} -match glob -result {1 {unknown or ambiguous subcommand "gorp": must be *cat, compare, equal, first, index, insert, is, last, length, map, match, range, repeat, replace, reverse, tolower, totitle, toupper, trim, trimleft, trimright, wordend, or wordstart}}
 test string-1.2.$noComp {error conditions} {
     list [catch {run {string}} msg] $msg
 } {1 {wrong # args: should be "string subcommand ?arg ...?"}}
@@ -525,10 +526,10 @@ test string-6.4.$noComp {string is, too many args} {
 } {1 {wrong # args: should be "string is class ?-strict? ?-failindex var? str"}}
 test string-6.5.$noComp {string is, class check} {
     list [catch {run {string is bogus str}} msg] $msg
-} {1 {bad class "bogus": must be alnum, alpha, ascii, control, boolean, dict, digit, double, entier, false, graph, integer, list, lower, print, punct, space, true, upper, wideinteger, wordchar, or xdigit}}
+} {1 {bad class "bogus": must be alnum, alpha, ascii, control, boolean, dict, digit, double, entier, false, graph, integer, list, lower, print, punct, space, true, upper, unicode, wideinteger, wordchar, or xdigit}}
 test string-6.6.$noComp {string is, ambiguous class} {
     list [catch {run {string is al str}} msg] $msg
-} {1 {ambiguous class "al": must be alnum, alpha, ascii, control, boolean, dict, digit, double, entier, false, graph, integer, list, lower, print, punct, space, true, upper, wideinteger, wordchar, or xdigit}}
+} {1 {ambiguous class "al": must be alnum, alpha, ascii, control, boolean, dict, digit, double, entier, false, graph, integer, list, lower, print, punct, space, true, upper, unicode, wideinteger, wordchar, or xdigit}}
 test string-6.7.$noComp {string is alpha, all ok} {
     run {string is alpha -strict -failindex var abc}
 } 1
@@ -961,6 +962,28 @@ test string-6.130.1.$noComp {string is entier, false on bad octal} {
 test string-6.131.$noComp {string is entier, false on bad hex} {
     list [run {string is entier -fail var 0X12345611234123456123456562345612345612345612345612345612345612345612345612345612345345XYZ}] $var
 } {0 88}
+test string-6.132.$noComp {string is unicode} {
+    run {string is unicode \U10FFFD\uD7FF\uE000\uFDCF\uFDF0}
+} 1
+test string-6.133.$noComp {string is unicode, upper surrogate} {
+    run {string is unicode \uD800}
+} 0
+test string-6.134.$noComp {string is unicode, lower surrogate} {
+    run {string is unicode \uDFFF}
+} 0
+test string-6.135.$noComp {string is unicode, noncharacter} {
+    run {string is unicode \uFFFE}
+} 0
+test string-6.136.$noComp {string is unicode, noncharacter} {
+    run {string is unicode \uFFFF}
+} 0
+test string-6.137.$noComp {string is unicode, noncharacter} {
+    run {string is unicode \uFDD0}
+} 0
+test string-6.138.$noComp {string is unicode, noncharacter} {
+    run {string is unicode \uFDEF}
+} 0
+
 
 test string-7.1.$noComp {string last, not enough args} {
     list [catch {run {string last a}} msg] $msg
@@ -1013,16 +1036,16 @@ test string-7.16.$noComp {string last, start index} {
     run {string last Üa ÜadÜad end-1}
 } 3
 
-test string-8.1.$noComp {string bytelength} {
+test string-8.1.$noComp {string bytelength} nodep {
     list [catch {run {string bytelength}} msg] $msg
 } {1 {wrong # args: should be "string bytelength string"}}
-test string-8.2.$noComp {string bytelength} {
+test string-8.2.$noComp {string bytelength} nodep {
     list [catch {run {string bytelength a b}} msg] $msg
 } {1 {wrong # args: should be "string bytelength string"}}
-test string-8.3.$noComp {string bytelength} {
+test string-8.3.$noComp {string bytelength} nodep {
     run {string bytelength "\xC7"}
 } 2
-test string-8.4.$noComp {string bytelength} {
+test string-8.4.$noComp {string bytelength} nodep {
     run {string b ""}
 } 0
 
@@ -1817,9 +1840,9 @@ test string-19.3.$noComp {string trimleft, unicode default} {
 test string-20.1.$noComp {string trimright errors} {
     list [catch {run {string trimright}} msg] $msg
 } {1 {wrong # args: should be "string trimright string ?chars?"}}
-test string-20.2.$noComp {string trimright errors} {
+test string-20.2.$noComp {string trimright errors} -body {
     list [catch {run {string trimg a}} msg] $msg
-} {1 {unknown or ambiguous subcommand "trimg": must be bytelength, cat, compare, equal, first, index, insert, is, last, length, map, match, range, repeat, replace, reverse, tolower, totitle, toupper, trim, trimleft, trimright, wordend, or wordstart}}
+} -match glob -result {1 {unknown or ambiguous subcommand "trimg": must be *cat, compare, equal, first, index, insert, is, last, length, map, match, range, repeat, replace, reverse, tolower, totitle, toupper, trim, trimleft, trimright, wordend, or wordstart}}
 test string-20.3.$noComp {string trimright} {
     run {string trimright "    XYZ      "}
 } {    XYZ}
@@ -1939,7 +1962,7 @@ test string-21.25.$noComp {string trimright, unicode} {
 
 test string-22.1.$noComp {string wordstart} -body {
     list [catch {run {string word a}} msg] $msg
-} -result {1 {unknown or ambiguous subcommand "word": must be bytelength, cat, compare, equal, first, index, insert, is, last, length, map, match, range, repeat, replace, reverse, tolower, totitle, toupper, trim, trimleft, trimright, wordend, or wordstart}}
+} -match glob -result {1 {unknown or ambiguous subcommand "word": must be *cat, compare, equal, first, index, insert, is, last, length, map, match, range, repeat, replace, reverse, tolower, totitle, toupper, trim, trimleft, trimright, wordend, or wordstart}}
 test string-22.2.$noComp {string wordstart} -body {
     list [catch {run {string wordstart a}} msg] $msg
 } -result {1 {wrong # args: should be "string wordstart string index"}}
diff --git a/tests/winDde.test b/tests/winDde.test
index dbadeb4..ad21426 100644
--- a/tests/winDde.test
+++ b/tests/winDde.test
@@ -37,6 +37,7 @@ proc createChildProcess {ddeServerName args} {
     file delete -force $::scriptName
 
     set f [open $::scriptName w+]
+    fconfigure $f -encoding utf-8
     puts $f [list set ddeServerName $ddeServerName]
     puts $f [list load $::ddelib Dde]
     puts $f {
@@ -96,7 +97,7 @@ proc createChildProcess {ddeServerName args} {
 
     # run the child server script.
     set f [open |[list [interpreter] $::scriptName] r]
-    fconfigure $f -buffering line
+    fconfigure $f -buffering line -encoding utf-8
     gets $f line
     return $f
 }
diff --git a/unix/Makefile.in b/unix/Makefile.in
index bd018d2..a304558 100644
--- a/unix/Makefile.in
+++ b/unix/Makefile.in
@@ -209,7 +209,7 @@ TCL_LIB_FLAG		= @TCL_LIB_FLAG@
 #TCL_LIB_FLAG		= -ltcl
 
 # support for embedded libraries on Darwin / Mac OS X
-DYLIB_INSTALL_DIR	= ${LIB_RUNTIME_DIR}
+DYLIB_INSTALL_DIR	= $(libdir)
 
 #--------------------------------------------------------------------------
 # The information below is modified by the configure script when Makefile is
@@ -268,6 +268,7 @@ TRACE_OPTS		=
 VALGRIND		= valgrind
 VALGRINDARGS		= --tool=memcheck --num-callers=24 \
 	--leak-resolution=high --leak-check=yes --show-reachable=yes -v \
+	--keep-debuginfo=yes \
 	--suppressions=$(TOOL_DIR)/valgrind_suppress
 
 #--------------------------------------------------------------------------
@@ -902,18 +903,13 @@ test-tcl: ${TCLTEST_EXE}
 	$(SHELL_ENV) ./${TCLTEST_EXE} $(TOP_DIR)/tests/all.tcl $(TESTFLAGS)
 
 gdb-test: ${TCLTEST_EXE}
-	@echo "set env @LD_LIBRARY_PATH_VAR@=`pwd`:$${@LD_LIBRARY_PATH_VAR@}" > gdb.run
-	@echo "set env TCL_LIBRARY=${TCL_BUILDTIME_LIBRARY}" >> gdb.run
-	@echo "set args $(TOP_DIR)/tests/all.tcl $(TESTFLAGS) -singleproc 1" >> gdb.run
-	$(GDB) ./${TCLTEST_EXE} --command=gdb.run
-	@rm gdb.run
+	$(SHELL_ENV) $(GDB) --args ./${TCLTEST_EXE} $(TOP_DIR)/tests/all.tcl \
+		$(TESTFLAGS) -singleproc 1
 
 lldb-test: ${TCLTEST_EXE}
-	@echo "settings set target.env-vars @LD_LIBRARY_PATH_VAR@=`pwd`:$${@LD_LIBRARY_PATH_VAR@}" > lldb.run
-	@echo "settings set target.env-vars TCL_LIBRARY=${TCL_BUILDTIME_LIBRARY}" >> lldb.run
-	$(LLDB) --source lldb.run ./${TCLTEST_EXE} -- $(TOP_DIR)/tests/all.tcl \
+	$(SHELL_ENV) $(LLDB) -- ./${TCLTEST_EXE} $(TOP_DIR)/tests/all.tcl \
 		$(TESTFLAGS) -singleproc 1
-	@rm lldb.run
+
 
 # Useful target to launch a built tcltest with the proper path,...
 runtest: ${TCLTEST_EXE}
diff --git a/unix/dltest/pkgooa.c b/unix/dltest/pkgooa.c
index ff1cf1f..5aa48a5 100644
--- a/unix/dltest/pkgooa.c
+++ b/unix/dltest/pkgooa.c
@@ -84,10 +84,13 @@ static TclOOStubs stubsCopy = {
     NULL, NULL, NULL, NULL, NULL, NULL, NULL,
     NULL, NULL, NULL, NULL, NULL, NULL, NULL,
     NULL, NULL, NULL, NULL, NULL, NULL, NULL,
-    NULL, NULL, NULL, NULL, NULL, NULL, NULL,
+    NULL, NULL, NULL, NULL, NULL, NULL, NULL
+#ifdef Tcl_MethodIsPrivate
+    ,NULL
+#endif
 };
 
-extern DLLEXPORT int
+DLLEXPORT int
 Pkgooa_Init(
     Tcl_Interp *interp)		/* Interpreter in which the package is to be
 				 * made available. */
diff --git a/unix/dltest/pkgua.c b/unix/dltest/pkgua.c
index 0ab3e23..a822541 100644
--- a/unix/dltest/pkgua.c
+++ b/unix/dltest/pkgua.c
@@ -21,6 +21,7 @@ static int    PkguaEqObjCmd(ClientData clientData,
 		Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]);
 static int    PkguaQuoteObjCmd(ClientData clientData,
 		Tcl_Interp *interp, int objc, Tcl_Obj *const objv[]);
+static void   CommandDeleted(ClientData clientData);
 
 /*
  * In the following hash table we are going to store a struct that holds all
@@ -30,23 +31,32 @@ static int    PkguaQuoteObjCmd(ClientData clientData,
  * need to keep the various command tokens we have registered, as they are the
  * only safe way to unregister our registered commands, even if they have been
  * renamed.
- *
- * Note that this code is utterly single-threaded.
  */
 
-static Tcl_HashTable interpTokenMap;
-static int interpTokenMapInitialised = 0;
+typedef struct ThreadSpecificData {
+    int interpTokenMapInitialised;
+    Tcl_HashTable interpTokenMap;
+} ThreadSpecificData;
+static Tcl_ThreadDataKey dataKey;
 #define MAX_REGISTERED_COMMANDS 2
 
+static void
+CommandDeleted(ClientData clientData)
+{
+    Tcl_Command *cmdToken = (Tcl_Command *)clientData;
+    *cmdToken = NULL;
+}
 
 static void
 PkguaInitTokensHashTable(void)
 {
-    if (interpTokenMapInitialised) {
+    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)Tcl_GetThreadData((&dataKey), sizeof(ThreadSpecificData));
+
+    if (tsdPtr->interpTokenMapInitialised) {
 	return;
     }
-    Tcl_InitHashTable(&interpTokenMap, TCL_ONE_WORD_KEYS);
-    interpTokenMapInitialised = 1;
+    Tcl_InitHashTable(&tsdPtr->interpTokenMap, TCL_ONE_WORD_KEYS);
+    tsdPtr->interpTokenMapInitialised = 1;
 }
 
 static void
@@ -54,12 +64,13 @@ PkguaFreeTokensHashTable(void)
 {
     Tcl_HashSearch search;
     Tcl_HashEntry *entryPtr;
+    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)Tcl_GetThreadData((&dataKey), sizeof(ThreadSpecificData));
 
-    for (entryPtr = Tcl_FirstHashEntry(&interpTokenMap, &search);
+    for (entryPtr = Tcl_FirstHashEntry(&tsdPtr->interpTokenMap, &search);
 	    entryPtr != NULL; entryPtr = Tcl_NextHashEntry(&search)) {
 	Tcl_Free((char *) Tcl_GetHashValue(entryPtr));
     }
-    interpTokenMapInitialised = 0;
+    tsdPtr->interpTokenMapInitialised = 0;
 }
 
 static Tcl_Command *
@@ -68,13 +79,14 @@ PkguaInterpToTokens(
 {
     int newEntry;
     Tcl_Command *cmdTokens;
+    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)Tcl_GetThreadData((&dataKey), sizeof(ThreadSpecificData));
     Tcl_HashEntry *entryPtr =
-	    Tcl_CreateHashEntry(&interpTokenMap, interp, &newEntry);
+	    Tcl_CreateHashEntry(&tsdPtr->interpTokenMap, (char *) interp, &newEntry);
 
     if (newEntry) {
 	cmdTokens = (Tcl_Command *)
-		Tcl_Alloc(sizeof(Tcl_Command) * (MAX_REGISTERED_COMMANDS+1));
-	for (newEntry=0 ; newEntry<MAX_REGISTERED_COMMANDS+1 ; ++newEntry) {
+		Tcl_Alloc(sizeof(Tcl_Command) * (MAX_REGISTERED_COMMANDS));
+	for (newEntry=0 ; newEntry<MAX_REGISTERED_COMMANDS ; ++newEntry) {
 	    cmdTokens[newEntry] = NULL;
 	}
 	Tcl_SetHashValue(entryPtr, cmdTokens);
@@ -88,8 +100,9 @@ static void
 PkguaDeleteTokens(
     Tcl_Interp *interp)
 {
+    ThreadSpecificData *tsdPtr = (ThreadSpecificData *)Tcl_GetThreadData((&dataKey), sizeof(ThreadSpecificData));
     Tcl_HashEntry *entryPtr =
-	    Tcl_FindHashEntry(&interpTokenMap, interp);
+	    Tcl_FindHashEntry(&tsdPtr->interpTokenMap, (char *) interp);
 
     if (entryPtr) {
 	Tcl_Free((char *) Tcl_GetHashValue(entryPtr));
@@ -199,7 +212,7 @@ Pkgua_Init(
     Tcl_Interp *interp)		/* Interpreter in which the package is to be
 				 * made available. */
 {
-    int code, cmdIndex = 0;
+    int code;
     Tcl_Command *cmdTokens;
 
     if (Tcl_InitStubs(interp, "8.5-", 0) == NULL) {
@@ -207,7 +220,7 @@ Pkgua_Init(
     }
 
     /*
-     * Initialise our Hash table, where we store the registered command tokens
+     * Initialize our Hash table, where we store the registered command tokens
      * for each interpreter.
      */
 
@@ -221,12 +234,12 @@ Pkgua_Init(
     Tcl_SetVar2(interp, "::pkgua_loaded", NULL, ".", TCL_APPEND_VALUE);
 
     cmdTokens = PkguaInterpToTokens(interp);
-    cmdTokens[cmdIndex++] =
-	    Tcl_CreateObjCommand(interp, "pkgua_eq", PkguaEqObjCmd, NULL,
-		    NULL);
-    cmdTokens[cmdIndex++] =
+    cmdTokens[0] =
+	    Tcl_CreateObjCommand(interp, "pkgua_eq", PkguaEqObjCmd, &cmdTokens[0],
+		    CommandDeleted);
+    cmdTokens[1] =
 	    Tcl_CreateObjCommand(interp, "pkgua_quote", PkguaQuoteObjCmd,
-		    NULL, NULL);
+		    &cmdTokens[1], CommandDeleted);
     return TCL_OK;
 }
 
diff --git a/unix/tclXtTest.c b/unix/tclXtTest.c
index 4ee7cca..882f497 100644
--- a/unix/tclXtTest.c
+++ b/unix/tclXtTest.c
@@ -16,7 +16,6 @@
 #include "tcl.h"
 
 static Tcl_ObjCmdProc TesteventloopCmd;
-extern DLLEXPORT Tcl_LibraryInitProc Tclxttest_Init;
 
 /*
  * Functions defined in tclXtNotify.c for use by users of the Xt Notifier:
@@ -44,7 +43,7 @@ extern XtAppContext	TclSetAppContext(XtAppContext ctx);
  *----------------------------------------------------------------------
  */
 
-int
+DLLEXPORT int
 Tclxttest_Init(
     Tcl_Interp *interp)		/* Interpreter for application. */
 {