python 3, subclassing TextIOWrapper.

[Benjamin Peterson]

Gabriel Genellina <gagsl-py2 <at> yahoo.com.ar> writes:
> 
> There is another alternative that relies on undocumented behaviour: use  
> open to create a *binary* file and wrap the resulting BufferedReader  
> object in your own TextIOWrapper.

How is that undocumented behavior? TextIOWrapper can wrap any buffer which
follows the io.BufferedIOBase ABC. BufferedReader is a subclass of
io.BufferedIOBase.