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I'd call it "technically a bug" - she's right, it's an odd behavior. Though yeah, it's a (very) slight over-optimization.
I'm curious what the perf cost of fast path in C w/ check for slow override path would be. My guess would be that it's nearly free.
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Adding integer overflow checks in C is ~1%. I'd expect Ruby to be slow enough that the analogous checking in C impl wouldn't be noticable?
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I don't know Ruby, so maybe that's totally wrong, but it should be pretty easy to check despite not knowing Ruby...
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Ruby does a lot of that kind of thing and it adds up (I work on the core language.)
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It's going to get a lot cheaper with JIT soon, we hope. Working on that now.
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