Union variants use Title names instead of indices #2967

Job	Run time
test_min_deps (windows-latest)	1m 5s
test_min_deps (ubuntu-latest)	38s
Integration Tests (pdm.lock)	31s
Integration Tests (pdm.minimal.lock)	24s
test (3.9, macos-latest)	1m 35s
test (3.9, ubuntu-latest)	1m 20s
test (3.10, ubuntu-latest)	1m 16s
test (3.10, macos-latest)	1m 12s
test (3.9, windows-latest)	1m 42s
test (3.11, windows-latest)	1m 59s
test (3.11, ubuntu-latest)	1m 15s
test_min_deps (macos-latest)	56s
test (3.12, windows-latest)	1m 45s
test (3.12, macos-latest)	56s
test (3.11, macos-latest)	1m 23s
test (3.12, ubuntu-latest)	1m 23s
test (3.10, windows-latest)	1m 42s
test (3.13, macos-latest)	59s
test (3.13, ubuntu-latest)	1m 39s
test (3.13, windows-latest)	2m 1s
Combine & check coverage	15s
	25m 56s

Provide feedback