Fix frozenset types (partial implementation of #3240)

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No description provided.

[codecov-io]

Codecov Report

Merging #3246 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3246   +/-   ##
=======================================
  Coverage   98.05%   98.05%           
=======================================
  Files          43       43           
  Lines        7871     7871           
  Branches     1354     1354           
=======================================
  Hits         7718     7718           
  Misses         60       60           
  Partials       93       93

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[asvetlov]

thanks

[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].
[new issue]: https://github.com/aio-libs/aiohttp/issues/new