Can you say that the internals of perl don't do the optimizations on user behalf? I'd hope that perl automatically thows out the expression w/o doing it fully if it finds out it's dead in the middle.
btw, your way is for those who don't have the concept, or truth table, memorized and reproduce it w/o thinking. Nothing wrong w/ it though.
Regardless, xor isn't something that is as easily applicapble such as, the plus operator or just the and operator.
Certain tools, for certain situations.
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