[issue28600] asyncio: Optimize loop.call_soon

[Andrew Svetlov]

Andrew Svetlov added the comment:

The patch looks good.
IIRC haypo added the check because people called `.call_later()` with coroutine instead of callback very often.

But checking in debug mode looks very reasonable to me if it is so expensive.

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<http://bugs.python.org/issue28600>
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