Andrew Svetlov <andrew.svet...@gmail.com> added the comment:

Hi. StreamReaderProtocol was leaked implementation detail, not a public 
reusable class. The protocol has too many "gray zones" where its implementation 
is not well defined or even wrong. 

This situation prevents us from stream API improvements which require changing 
these implementation details. Keeping full backward compatibility literally 
means doubling source code, it makes no sense for "private" API but adds a huge 
maintenance burden.

We are striving to remove it from public API step by step: 
documentation-deprecation-removal.

If you really need the class -- please copy-paste the source lines into your 
project and use the copy on your own.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37639>
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