What's new in Tornado 6.0.3
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Jun 22, 2019
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Bug fixes
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- `.gen.with_timeout` always treats ``asyncio.CancelledError`` as a
  ``quiet_exception`` (this improves compatibility with Python 3.8,
  which changed ``CancelledError`` to a ``BaseException``).
- ``IOStream`` now checks for closed streams earlier, avoiding
  spurious logged errors in some situations (mainly with websockets).