Avoid normalizing child paths when there are no dots in the path

[bdraco]

Avoid normalizing child paths when there are no dots in the path

This one will need quite a few more tests if benchmarks shows its worth working on

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.81%. Comparing base (9107005) to head (6f6ab95).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1248      +/-   ##
==========================================
+ Coverage   95.80%   95.81%   +0.01%     
==========================================
  Files          27       27              
  Lines        5126     5142      +16     
  Branches      310      310              
==========================================
+ Hits         4911     4927      +16     
  Misses        189      189              
  Partials       26       26              

Flag	Coverage Δ
CI-GHA	95.79% <100.00%> (+0.01%)	⬆️
MyPy	43.68% <64.70%> (+0.06%)	⬆️
OS-Linux	99.35% <100.00%> (+<0.01%)	⬆️
OS-Windows	99.41% <100.00%> (+<0.01%)	⬆️
OS-macOS	99.06% <100.00%> (+<0.01%)	⬆️
Py-3.10.11	98.96% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	99.23% <100.00%> (+<0.01%)	⬆️
Py-3.11.10	99.23% <100.00%> (+<0.01%)	⬆️
Py-3.11.9	98.96% <100.00%> (+<0.01%)	⬆️
Py-3.12.7	99.23% <100.00%> (+<0.01%)	⬆️
Py-3.13.0	99.23% <100.00%> (+<0.01%)	⬆️
Py-3.8.10	98.91% <100.00%> (+<0.01%)	⬆️
Py-3.8.18	99.18% <100.00%> (+<0.01%)	⬆️
Py-3.9.13	98.91% <100.00%> (+<0.01%)	⬆️
Py-3.9.20	99.18% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.11	99.23% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	99.23% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.17	99.26% <100.00%> (+<0.01%)	⬆️
VM-macos-latest	99.06% <100.00%> (+<0.01%)	⬆️
VM-ubuntu-latest	99.35% <100.00%> (+<0.01%)	⬆️
VM-windows-latest	99.41% <100.00%> (+<0.01%)	⬆️
pytest	99.35% <100.00%> (+<0.01%)	⬆️

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[codspeed-hq]

CodSpeed Performance Report

Merging #1248 will improve performances by 8.44%

_{Comparing avoid_normalize_when_making_child_if_no_dot (6f6ab95) with master (9107005)}

Summary

⚡ 2 improvements
✅ 39 untouched benchmarks

Benchmarks breakdown

	Benchmark	master	avoid_normalize_when_making_child_if_no_dot	Change
⚡	test_url_joinpath_encoded	1.6 ms	1.5 ms	+7.77%
⚡	test_url_joinpath_with_truediv	1.9 ms	1.7 ms	+8.44%