I know that’s a major reason why I don’t use them more often. I was bitten by reject vs reject! In one of my more notable “oh shit. I just broke everything” events.https://twitter.com/nateberkopec/status/1038125248045047809 …
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But that doesn't mean that changes which are significant in gems are something that app developers should care about or are likely to benefit from, unless it's somewhere that there's a known perf problem.
Most pathological example -- I remember a few years ago way too many people were sharing an article "http://block.call is twice as slow as yield!!!!" telling app developers to stop using `&block` which was just...........
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That case is VM specific, and also just not important. It's 8ns on my personal machine, which will not add up to a measurable difference in app or gem code. We have *one* place in Rails which cares https://github.com/rails/rails/blob/dd29fabebf1b702031213361b7757be5892cd59f/activerecord/lib/active_record/attribute_methods/read.rb#L67-L79 … and it's the hottest of hot paths
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