|> Personally I don't like like this behaviour much, but it was added in 5.004, before my time as a p5 porter
Which of both?
I personally find the behaviour of the sub arg aliasing far less surprising.
The other behaviour rather looks like sacrificing logic for performance or easier code logic.
I suppose changing that might be too expensive now, but most code doesn't try to assign to $_ in a loop.
If we are going to keep this behaviour, we'll need to document it properly.
loop aliasing always triggers autovivification
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