Until "!0" is documented to return specifically "1" and not just "a true value", your coding is dangerous.
Sure, !0 has been 1 in every implementation of Perl (so far), but there's no doc that supports that. It's merely an artifact of implementation. "!0" could return "4" and still perfectly satisfy all external Perl docs. I see nothing in perldata or perlop to validate that !0 is precisely "1". Just "true".
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