You know, that could explain why, with the code I'm working on, I keep finding invalid prototype definitions for things and yet there's no associated warnings. Things like this:

# Five in prototype...
sub foo($$$$$)
{
     my ($self, $foo, $bar, $baz, $bim, $bam) = @_;  # Six in list
     # ...
}
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Things like this are routinely called, and yet, never and warnings. Thanks for the heads up.

It's good to know that prototypes are useless in that context.