[issue39168] Generic type subscription is a huge toll on Python performance

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

Sorry, you already said 3.6 and 3.8 give the same effect. But what if you add a minimal __new__() to Foo?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39168>
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