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P5P is considering to drop the population of @_ when signatures are used
But only after alternative facilities for argument instrospection have been provided. See the proposal on the p5p mailing list.

In particular, in

sub foo($x, ??$has_y, $y = 0) { ... }
$has_y is true if and only if a second arg is passed to the sub.

Dave.


In reply to Re^2: Distinguish between missing and undefined arguments with subroutine signatures by dave_the_m
in thread Distinguish between missing and undefined arguments with subroutine signatures by jo37

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