[docs] [issue29724] Itertools docs propose a harmful “speedup” without any explanation

[Leonid R.]

Leonid R. added the comment:

I think this is a "last resort" optimization and shouldn't be encouraged, especially in the official documentation. There are plenty of real optimizations you can do before doing micro-optimizations like this, and there is no reason it should be mentioned in the docs.

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nosy: +leovp

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