[issue32356] asyncio: Make transport.pause_reading()/resume_reading() idempotent; add transport.is_reading()

[Yury Selivanov]

New submission from Yury Selivanov <yselivanov at gmail.com>:

As briefly discussed on https://github.com/python/asyncio/issues/488 and https://github.com/python/cpython/pull/528

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messages: 308509
nosy: yselivanov
priority: normal
severity: normal
status: open
title: asyncio: Make transport.pause_reading()/resume_reading() idempotent; add transport.is_reading()

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<https://bugs.python.org/issue32356>
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