It is very much not a good thing, especially when Perl forgets to reinitialize that memory as happens with the infamous my $foo if cond();
bug when the condition is false.
<gripe>Which would have triggered a warning in Perl 5.10, but p5p in its infinite wisdom decided that there would be too many real bugs reported, and therefore will only report a warning in the case where the author probably intended the odd behaviour.</gripe>
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