[issue15216] Support setting the encoding on a text stream after creation

[Nick Coghlan]

Nick Coghlan added the comment:

Thanks, Andrei, that would be great.

The tests and the Python version in Victor's patch show the desired API and behaviour.

In theory, the C version should just be a matter of adding an equivalent textiowrapper_set_encoding method as a static function in 
hg.python.org/cpython/file/default/Modules/_io/textio.c

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