in reply to require Math::XOR
Hrmph; Math::XOR::xor_buf($a,$b) does nothing different
than "$a"^"$b" (except that it ignores anything in $b beyond
the end of $a, and is broken for utf8 data, and doesn't try to convert the input to a string if given a non-string (e.g. an overloaded object, or a numeric-only scalar)).
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