There is no such hack I know of. What I've seen on CPAN (in List::MoreUtils, for instance) is attempts to allow "enough" arguments: 
sub each_array (\@;\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@\@) {

[download]
That seems to be the dissatisfactory state of the art in this respect.

Anno

In reply to Re: prototypes: so many \@'s? by Anno
in thread prototypes: so many \@'s? by dk

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