Correctly handle zero explicit_port

[gmacon]

What do these changes do?

This changes URL.port to return the explicit port instead of the default port when the explicit port is zero (i.e. not-None but falsy).

Are there changes in behavior for the user?

The URL.port attribute is supposed to give the port part of the URL with a scheme-based fallback, but it incorrectly used the fallback value when the given value was zero. This fixes the bug, returning the given value even when it is zero.

Related issue number

Fixes #1408

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes

[codspeed-hq]

CodSpeed Performance Report

Merging #1413 will not alter performance

_{Comparing gmacon:1408-zero-port-xfail (8b183cb) with master (d6a65eb)}

Summary

✅ 83 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.06%. Comparing base (dfc41db) to head (8b183cb).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1413   +/-   ##
=======================================
  Coverage   96.06%   96.06%           
=======================================
  Files          31       31           
  Lines        5765     5772    +7     
  Branches      344      345    +1     
=======================================
+ Hits         5538     5545    +7     
  Misses        201      201           
  Partials       26       26           

Flag	Coverage Δ
CI-GHA	96.06% <100.00%> (+<0.01%)	⬆️
MyPy	48.67% <50.00%> (-0.01%)	⬇️
OS-Linux	99.55% <100.00%> (+<0.01%)	⬆️
OS-Windows	99.62% <100.00%> (+<0.01%)	⬆️
OS-macOS	99.30% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	99.28% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	99.51% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	99.51% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	99.28% <100.00%> (+<0.01%)	⬆️
Py-3.12.7	99.51% <100.00%> (+<0.01%)	⬆️
Py-3.13.0	99.51% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	99.23% <100.00%> (+<0.01%)	⬆️
Py-3.9.20	99.47% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	99.53% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.17	99.55% <100.00%> (+<0.01%)	⬆️
VM-macos-latest	99.30% <100.00%> (+<0.01%)	⬆️
VM-ubuntu-latest	99.55% <100.00%> (+<0.01%)	⬆️
VM-windows-latest	99.62% <100.00%> (+<0.01%)	⬆️
pytest	99.55% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[asvetlov]

Looks good, thanks.

[webknjaz]

Thanks!