foreach my $key (keys %hash) { }
Is that actually slower? Got benchmarks to back that up?
And if it IS, then why should it be? There are specialized magic iterators when the parser recognizes an impending iteration with constants, like for (1 .. 1_000_000). Why does perl not implement an automatic iterator when the parser notices a simple sort-free for (keys %foo)? That's such a common idiom I would be amazed it wasn't getting special attention.
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