[issue32236] open() shouldn't silently ignore buffering=1 in binary mode

[Alexey Izbyshev]

Alexey Izbyshev <izbyshev at ispras.ru> added the comment:

I had similar thoughts when I was fixing tests that broke due to ValueError. I've updated the PR to issue a RuntimeWarning instead.

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<https://bugs.python.org/issue32236>
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