Test

add serializable protocol #6639

Job	Run time
doctests	57s
py=3.14-upstream	3m 1s
py=3.12-min_deps	3m 2s
os=macos-latest, py=3.12, deps=optional	3m 3s
os=ubuntu-latest, py=3.12, deps=optional	3m 1s
os=ubuntu-latest, py=3.13, deps=optional	3m 1s
os=ubuntu-latest, py=3.14, deps=optional	3m 1s
os=ubuntu-latest, py=3.12, deps=minimal	3m 0s
os=windows-latest, py=3.14, deps=optional	2m 54s
os=ubuntu-latest, py=3.13, deps=minimal	3m 2s
os=windows-latest, py=3.12, deps=optional	2m 55s
os=macos-latest, py=3.14, deps=optional	3m 3s
os=ubuntu-latest, py=3.14, deps=minimal	3m 3s
Test complete	3s
	37m 6s

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