Test

fix: accept unknown metadata fields with must_understand=false #7548

Job	Run time
py=3.14-upstream	7m 55s
py=3.12-min_deps	6m 20s
doctests	53s
Benchmark smoke test	8m 1s
os=ubuntu-latest, py=3.13, deps=optional	7m 21s
os=ubuntu-latest, py=3.14, deps=optional	4m 57s
os=ubuntu-latest, py=3.14, deps=minimal	4m 5s
os=ubuntu-latest, py=3.12, deps=minimal	6m 22s
os=ubuntu-latest, py=3.13, deps=minimal	6m 27s
os=macos-latest, py=3.14, deps=optional	4m 52s
os=macos-latest, py=3.12, deps=optional	6m 52s
os=ubuntu-latest, py=3.12, deps=optional	7m 28s
os=windows-latest, py=3.14, deps=optional	7m 7s
os=windows-latest, py=3.12, deps=optional	10m 23s
Test complete	4s
	1h 29m 7s

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