Some of your questions compare inequivalent statements, mostly in regard of global variables.
I know. Style and equality have not much to do with eachother. While it is true that all of the pairs display two approaches to the same problem, "use strict; or no strict;?" could easily have been one of the questions.
Take for example the list assignment vs shifts question. They are not equivalent. Of course they are not - I hope everyone reading this thread realises what the differences are. But it *is* a question of style when @_ is not used elsewhere.
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