Oops. It took me a while to figure out that you were using square brackets. By the time I figured that out, it looks like I had changed from [@-Z] (interpolation of var @- plus "Z") to [\@-Z] (short for [\@A-Z]).

In ASCII-based encodings, "@" is "\x40", the character before "A".

In reply to Re^6: hard-to-understand taint error by ikegami
in thread hard-to-understand taint error by cmac

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