it is very poor style to alter the input data in a map
Can you explain the reason behind this to me? I have never seen $_ localized inside of a map. I don't see why it's so bad to modify $_ inside the map. Unless you're maping through a list of references in which case you'd be modifying the original structure. I must admit to never having seen localized $_ in a map and that I've seen a million scripts that mangle $_ to death in such cases.
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