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Smart match and given/when are horribly complex and confusing (see "Smart matching in detail" in perlsyn), with the semantics changing between versions. AFAICT they may even change again in some future Perl, as many people on perl5-porters think they're broken. I'd just stick to "exists $hash{a}", which is not much more to type, and works.

In reply to Re: Wrong behavior of the implicit smart operator in the given/when blocks by educated_foo
in thread Wrong behavior of the implicit smart operator in the given/when blocks by Anonymous Monk

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