Call me wool headed, but none of the samples here look maintainable to me - for one simple reason.
Not one of them contains a single comment about what the code is supposed to do or what it is actually doing.
Apparently perl does not support the inclusion of comments in code.
I know when I'm maintaining existing code, I like to have to act like a language interpreter in my head to determine what a bunch of code is doing - comments are for noobies.
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