Dong-hee Na <donghee...@python.org> added the comment:

> +0 I don't see any downside.

Thank you Raymond :)
I agree with your view, At first, I thought that instantiation time reducing is 
also meaningful and we already applied PEP 590 for some of the types to reduce 
instantiation. (e.g range(), list(), dict(), bool(), reversed(), type()..)

And also I thought that filter is one of the well-used features in Python so it 
was one of the candidates to apply from my sight. ;)

But if this PR only consume maintenance cost, I am okay with not to apply it 
doesn't matter :)

And happy new year Raymond(Sorry I am late ;) But the lunar new year was only 
2weeks ago so not too late lol)

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<https://bugs.python.org/issue43287>
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