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Comprehensive string handling rewrite #3464

Job	Run time
Integration Tests (pdm.lock)	27s
test (3.11, ubuntu-latest)	47s
test_min_deps (macos-latest)	56s
test_min_deps (ubuntu-latest)	57s
Integration Tests (pdm.minimal.lock)	40s
test_min_deps (windows-latest)	1m 33s
test (3.14, ubuntu-latest)	49s
test (3.14, macos-latest)	36s
test (3.11, windows-latest)	46s
test (3.13, windows-latest)	46s
test (3.12, windows-latest)	47s
test (3.13, ubuntu-latest)	37s
test (3.13, macos-latest)	40s
test (3.11, macos-latest)	34s
test (3.12, macos-latest)	44s
test (3.14, windows-latest)	44s
test (3.12, ubuntu-latest)	37s
Combine & check coverage	0s
	13m 0s