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Re:Ruby vs. Crystal Performance by chrisseaton on Saturday June 06, 2020 @03:00AM (#23437367)
> Metaprogramming doesn't need to have a performance impact.

Optimising away the performance impact of most of the metaprogramming features I mentioned there requires truly heroic optimisations, beyond what has ever been used for any other language.

Some of them are even worse - I'm not sure there any way to optimise away the non-local effects of Proc#binding, which allows you to access local variables not lexically referenced.

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