There's something fishy about $_. It's a TEMP with REFCNT=1. I believe that means it's a mortal. If so, that means noone claims a reference to $_, but first still uses it after the callback returns. This points to a bug in List::Util.
That said, the inplace lc($_) should probably only happen in void context.
- This is the first I've ever heard about this!
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