[issue4428] make io.BufferedWriter observe max_buffer_size limits

[Guido van Rossum]

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

@Gregory, that sounds like an odd enough use case to skip.  However you
might want to look for __length_hint__ before giving up?

OTOH unless the use case is real, why not support it but making it slow?

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