I tend to favor the join myself for one-liners like that, but I always include an empty item after @INC so the last line will get a newline on it.

   perl -e 'print join "\n", @INC, ""'
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The variant that uses "for @INC" avoids that question; perhaps I may need to make a style change. I wonder how they compare for performance, when run in a tight loop?

push @things_to_do, performance_test( $foreach, $join );
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