Add clean fix for cancelation on 3.9+.

[Dreamsorcerer]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (97161bf) to head (dbec807).
Report is 147 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #235   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            1         1           
  Lines          107       115    +8     
  Branches        16        18    +2     
=========================================
+ Hits           107       115    +8     

Flag	Coverage Δ
unit	96.52% <85.71%> (-1.61%)	⬇️

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[webknjaz]

@Dreamsorcerer do you want to resurrect this effort?

[webknjaz]

Is it related to #295?

[Dreamsorcerer]

@Dreamsorcerer do you want to resurrect this effort?

I will return to this in some form, and verify if the problem is actually fixed in asyncio.timeout() or not. But, this library itself should probably be deprecated (and archived once asyncio.timeout() is available in all supported versions of Python).

Is it related to #295?

Yes, I'm pretty sure that PR is incorrect, as explained in my comments.

[asvetlov]

Version 5.0+ wiorks exactly as asyncio built-in does, nothing to do here.