[issue35611] open doesn't call IncrementalEncoder with final=True

[Martin Panter]

Martin Panter <vadmium+py at gmail.com> added the comment:

FWIW this happens with the built-in IDNA codec, and Amaury gave a demonstration under <https://bugs.python.org/issue17404#msg184045>.

I don’t think the “TextIOWrapper.flush” method should use final=True, but “close” and “detach” probably should.

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nosy: +martin.panter

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<https://bugs.python.org/issue35611>
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