Yury Selivanov <yseliva...@gmail.com> added the comment:

> I tried to implement such optimization in my old 
> https://faster-cpython.readthedocs.io/fat_python.html project. I implemented 
> guards to de-optimize the code if a builtin is overriden.

FWIW the globals opcode cache handles all of this now. There's no point in 
specifically optimizing the builtins lookup since we optimize all global 
lookups for a code object that's hot enough.

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<https://bugs.python.org/issue42990>
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