* generic/tclStringObj.c: Several revisions to the shimmering

        patterns between Unicode and UTF string reps.  Most notably the
        call: objPtr = Tcl_NewUnicodeObj(...,0); followed by a loop of calls:
        Tcl_AppendUnicodeToObj(objPtr, u, n); will now grow and append to
        the Unicode representation.  Before this commit, the sequence would
        convert each append to UTF and perform the append to the UTF rep.
        This is puzzling and likely a bug.  The performance of [string map]
        is significantly improved by this change (according to the MAP
        collection of benchmarks in tclbench).  Just in case there was some
        wisdom in the old ways that I missed, I left in the ability to restore
        the old patterns with a #define COMPAT 1 at the top of the file.

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