New submission from Andrew Svetlov <andrew.svet...@gmail.com>:

The separation was a bad idea, sorry. Both classes are coupled too much.
1. Writer should know about the reader to make `drain()` work
2. Reader has no .close() method.

The idea is: 
1. Merge StreamReader and StreamWriter into just a Stream.
2. The Stream should support three modes: readonly, writeonly, readwrite.
3. Keep StreamReader/StreamWriter but deprecate these classes.
4. Replace all asyncio internals to use Stream class.

----------
components: asyncio
messages: 342212
nosy: asvetlov, yselivanov
priority: normal
severity: normal
status: open
title: Merge StreamWriter and StreamReader into just asyncio.Stream
versions: Python 3.8

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue36889>
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