Did some more googling around and turned this up: https://www.nntp.perl.org/group/perl.perl5.changes/2022/05/msg58981.html

So looks like there was a change to Dumper module fairly recently. I've never seen the !!1 format for true, though. What is the origin story here?

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In reply to Re: Why is Dumper returning "!!1" for true file test? by nysus
in thread Why is Dumper returning "!!1" for true file test? by nysus

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