Change type of Payload.size from Optional[float] to Optional[int]

[kxepal]

What do these changes do?

This changes type of Payload.size property from float to int. Since this property defines amount of bytes which payload contains, it's impossible to have there floating point value.

This behavior was introduced in #3294.

Are there changes in behavior for the user?

It's possible to break some annotations for users custom Payload instances, but no runtime issues should be caused.

[kornicameister]

@kxepal AFAIR I have similar doubts. I think it was coming from another portion of the code that received typings earlier. @asvetlov might remember more as he reviewed the code.

[asvetlov]

Sorry, adding types was a very massive change.
If int works -- let's apply the change.

[codecov-io]

Codecov Report

Merging #3484 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master    #3484   +/-   ##
=======================================
  Coverage   97.92%   97.92%           
=======================================
  Files          44       44           
  Lines        8567     8567           
  Branches     1383     1383           
=======================================
  Hits         8389     8389           
  Misses         74       74           
  Partials      104      104

Impacted Files	Coverage Δ
aiohttp/payload.py	98.63% <100%> (ø)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 0715ae7...48ac7f8. Read the comment docs.

[lock]

This thread has been automatically locked since there has not been
any recent activity after it was closed. Please open a new issue for
related bugs.

If you feel like there's important points made in this discussion,
please include those exceprts into that new issue.