Wow, nice find, thanks for that. I'm pretty sure that setting the limit to 4 in the first case saves some cpu cycles, but setting it to 0 in the second case is pretty crazy, given the special behavior of split() in this case.
Here's one more:
What's the difference between
( $a, $b, $c ) = split /:/, $str;
and
( $a, $b, $c, @options ) = split /:/, $str;
when $str = "foo:bar:"?
Spoiler: Adding @options to the left hand side makes $c undef'd!
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