Full typing for scrapy/extensions, part 3.

[wRAR]

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[codecov]

Codecov Report

Attention: Patch coverage is 97.17514% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 88.87%. Comparing base (1d11ea3) to head (f5b65de).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6325      +/-   ##
==========================================
+ Coverage   83.92%   88.87%   +4.94%     
==========================================
  Files         161      161              
  Lines       11972    12003      +31     
  Branches     1865     1930      +65     
==========================================
+ Hits        10048    10668     +620     
+ Misses       1588      982     -606     
- Partials      336      353      +17     

Files	Coverage Δ
scrapy/extensions/postprocessing.py	98.41% <100.00%> (ø)
scrapy/utils/iterators.py	93.33% <ø> (+1.36%)	⬆️
scrapy/extensions/httpcache.py	94.84% <97.01%> (-0.64%)	⬇️
scrapy/extensions/feedexport.py	94.53% <97.24%> (+11.20%)	⬆️

... and 25 files with indirect coverage changes