to do something, but that is not always the case. As an obvious example, optimizing compilers can generally do register allocation as well as humans could.
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It doesn't necessarily mean they should do that, because maybe they don't have time / aren't capable of / etc. doing the optimal thing. But there's a difference between _choosing_ to make inefficient code, and _not knowing_ you made inefficient code.
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Yet another way to say it would be to say that "zero cost abstractions" are often "zero cost" in the same way that watching a movie on Netflix is "zero cost". It's only "zero cost" if you don't count the $15/mo subscription fee, the fact that the selection is limited, etc.
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