I whipped up two quick tests: gist.github.com/matthewpersico/aa1... and gist.github.com/matthewpersico/aa1... and yes, not having that local can be disastrous. So, since for and map and the like are coded "properly", i.e., they localize $_, you should be safe to use them and use functions that call them. But if someone has done this $_ assignment trick and forgets the local, there be dragons.
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I whipped up two quick tests:
gist.github.com/matthewpersico/aa1... and gist.github.com/matthewpersico/aa1... and yes, not having that
localcan be disastrous. So, sinceforandmapand the like are coded "properly", i.e., theylocalize$_, you should be safe to use them and use functions that call them. But if someone has done this$_assignment trick and forgets thelocal, there be dragons.