* generic/tclStringObj.c: Revisions so that we avoid creating

        the strange representation of an empty string with
        objPtr->bytes == NULL and stringPtr->hasUnicode == 0.  Instead in
        the situations where that was being created, create a traditional
        two-legged stork representation (objPtr->bytes = tclEmptyStringRep
        and stringPtr->hasUnicode = 1).  In the situations where the strange
        rep was treated differently, continue to do so by testing
        stringPtr->numChars == 0 to detect it.  These changes make the code
        more conventional so easier for new maintainers to pick up.  Also
        sets up further simplifications.

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