That has to do with @_ right?
Partially. See this relevant bit from the perldoc:
NAME(LIST); # & is optional with parentheses.
NAME LIST; # Parentheses optional if predeclared/imported.
&NAME(LIST); # Circumvent prototypes.
&NAME; # Makes current @_ visible to called subroutine.
So the passing of @_ is affected, as is the prototyping. I'm not too familiar with prototypes in Perl, so I'm not sure how things are affected when prototypes are circumvented... which is why I pointed to the perldocs instead of spelling it out myself. I know there's a difference, but haven't really looked into it. ;)
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