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\ No newline at end of file + +The source code for Tcl is managed by fossil. Tcl developers coordinate all +changes to the Tcl source code at + +> [Tcl Source Code](https://core.tcl-lang.org/tcl/timeline) + +Release Tcl 8.7b1 arises from the check-in with tag core-8.7-b1. + +Highlighted differences between Tcl 8.7 and Tcl 8.6 are summarized below, +with focus on changes important to programmers using the Tcl library and +writing Tcl scripts. + +## Internationalization of text + - Full Unicode range of codepoints + - New encodings: utf-16/utf-32/ucs-2(le|be), CESU-8, etc. + - `encoding` options -profile, -failindex manage encoding of I/O. + - `msgcat` supports custom locale search list + - `source` defaults to -encoding utf-8 + +## Zip filesystems and attached archives. + +## Unix notifiers available using epoll() or kqueue() + - relieves limits on file descriptors imposed by legacy select() + +## Notable incompatibilities + - No --disable-threads build option. Always thread-enabled. + - Windows platform needs Windows 7 or Windows Server 2008 R2 or later + +## New commands + - `array default`, `array for` + - `coroinject`, `coroprobe` + - `clock add weekdays` + - `dict getdefault` + - `file tempdir`, `file home`, `file tildeexpand` + - `info commandtype` + - `ledit` + - `lpop` + - `lremove` + - `lseq` + - `package files` + - `string insert`, `string is dict` + - `tcl::process` + - `*::build-info` + +## New command options + - `regsub ... -command ...` + - `lsearch ... -stride ...` + - `clock scan ... -validate ...` + - `socket ... -nodelay ... -keepalive ...` + - `vwait` controlled by several new options + +## Numbers + - 0dNNNN format to compel decimal interpretation. + - NN_NNN_NNN, underscores in numbers for optional readability + - Functions: isinf() isnan() isnormal() issubnormal() isunordered() + - `fpclassify` + - Function int() no longer truncates to word size + +## tcl::oo facilities + - private variable and methods + - `method -export`, `method -unexport` + |