Currently several properties are concrete, even though `IO` and `TextIO` are ABCs. Originally https://github.com/python/mypy/issues/266.
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JelleZijlstra commentedon May 17, 2018
If we do this, we should be careful to not accidentally make subclasses non-instantiable (#1476).
AlexWaygood commentedon Sep 23, 2022
Note that #8726 tried to fix this, but the mypy_primer output indicated that it would have been hugely disruptive
`typing.pyi`: Improve comments for `IO`/`TextIO`
`typing.pyi`: Improve comments for `IO`/`TextIO` (#8913)