In How a Perl 5 Program Works and On Parsing Perl 5, I mentioned ways to manipulate the Perl 5 parser as it executes. The easiest way to do so is through the use of Perl 5 subroutine prototypes. This early draft excerpt from Modern Perl: the book explains the good and the bad of prototypes and when they're a good idea in modern Perl code. Perl 5's prototypes serve two purposes. First, they're hint
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