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I've always loved the recent[1] summary from `perlre`:

>o - pretend to optimize your code, but actually introduce bugs

1: I still think of it as a relatively new change, but it's from 2013: <https://github.com/Perl/perl5/commit/7cf040c1f649790a4040aec...>



It's older than that. The article links to this conversation about it in 2003: https://www.perlmonks.org/?node_id=256053




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