I wonder if putting all String literals in constants improves performance? I should probably read Ruby Under The Microscope...
patshaughnessy.net/ruby-unde…
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Constants aren’t constant so using them over frozen string literals will actually be slower as they require a lookup under the hood.
When in doubt benchmark/ips
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Ruby constants are actually constant in JITed code in TruffleRuby. A frozen string literal is always constant, so that's as good or better if the implementation does not fold Ruby constants.
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So, to get the idea, you optimize to return the possibly mutable object saving a constant lookup, and invalidate/refresh that optimization if there's const removal + set again (as in "reloading"), or re-assignment?
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