cequal string string:   This command compares two strings for equality.  It returns 1 if string1 and string2 are the identical and 0 if they are not.  This command is a short-cut for string compare and avoids the problems with string expressions being treated unintentionally as numbers.

This command is UTF-aware and will also work on binary data.

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[Category Command] in [Tclx] extension