Hmm interesting, and it seems there is no consensus what's happening.
- Dave_the_m says the qr object is always duplicated because matches depend on scope.
- Aristotle says, using an additional /o modifier closes the performance gap ... but will alter the semantics
- Demerphq says he doesn't know what's going on.
I think the first and second statement are contradictory or probably hinting at a bug somewhere.
Anyway I'm confused, there may be a difference if a $var= qr/.../ is used directly as a RHS of a match or is interpolated inside a bigger regex.
And since it's possible to stringify a qr-object and use the string instead, this adds another layer of confusion.
I have to think hard about a concise way to test all of this which wouldn't result in a tl;dr monstrum.
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