Union variants use Title names instead of indices (#1301) #2968

Job	Run time
Integration Tests (pdm.minimal.lock)	29s
test_min_deps (ubuntu-latest)	43s
Integration Tests (pdm.lock)	31s
test_min_deps (macos-latest)	53s
test (3.9, ubuntu-latest)	1m 19s
test_min_deps (windows-latest)	1m 3s
test (3.10, ubuntu-latest)	1m 25s
test (3.10, windows-latest)	1m 51s
test (3.11, macos-latest)	55s
test (3.9, macos-latest)	1m 34s
test (3.9, windows-latest)	1m 44s
test (3.11, ubuntu-latest)	1m 19s
test (3.11, windows-latest)	1m 40s
test (3.12, macos-latest)	53s
test (3.10, macos-latest)	1m 15s
test (3.13, windows-latest)	1m 56s
test (3.13, ubuntu-latest)	1m 44s
test (3.12, ubuntu-latest)	1m 28s
test (3.12, windows-latest)	1m 45s
test (3.13, macos-latest)	1m 15s
Combine & check coverage	14s
	25m 56s

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