You might want to look up the $; entry in perlvar.

$hash{'C','D'} is short for $hash{join($;,'C','D')}, with $; defaulting to "\034", which is the same as "\x1c".

In reply to Re: Comma Operator, BUG or feature ??? by JavaFan
in thread Comma Operator, BUG or feature ??? by nif

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