Amaury Forgeot d'Arc added the comment:
The proposed workaround seems to work ("wb" instead of "wt"!), with the
following restrictions:
- it's not really unbuffered: the encoder has its own buffers (OK, in the
stdlib only 'idna' encoding will retain data)
- it won't work for reading: TextIOWrapper calls the read1() method, which is
only defined by BufferedIO objects.
IMO this explains why it's not a supported combination in io.open().
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nosy: +amaury.forgeotdarc
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