Forbid unknown web.Application attributes

[asvetlov]

No description provided.

[codecov-io]

Codecov Report

Merging #3542 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #3542      +/-   ##
=========================================
+ Coverage   97.88%   97.9%   +0.02%     
=========================================
  Files          43      43              
  Lines        8585    8752     +167     
  Branches     1388    1450      +62     
=========================================
+ Hits         8403    8569     +166     
  Misses         75      75              
- Partials      107     108       +1

Impacted Files	Coverage Δ
aiohttp/web_app.py	98.88% <100%> (-0.01%)	⬇️
aiohttp/helpers.py	97.53% <0%> (+0.78%)	⬆️

---

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 f590bfd...f60827c. Read the comment docs.

[kxepal]

👍

[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.