Require protocol_version to be a string (#2763) #2442

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	29s
checks / test (3.10, lowest-direct, windows-latest)	2m 54s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.10, locked, windows-latest)	2m 3s
checks / test (3.10, locked, ubuntu-latest)	1m 2s
checks / test (3.11, locked, ubuntu-latest)	1m 3s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.12, lowest-direct, windows-latest)	3m 37s
checks / test (3.13, locked, windows-latest)	2m 20s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 24s
checks / test (3.13, lowest-direct, ubuntu-latest)	54s
checks / test (3.13, locked, ubuntu-latest)	54s
checks / test (3.11, locked, windows-latest)	2m 43s
checks / test (3.14, locked, ubuntu-latest)	2m 24s
checks / test (3.12, locked, ubuntu-latest)	55s
checks / test (3.12, locked, windows-latest)	3m 32s
checks / test (3.13, lowest-direct, windows-latest)	2m 34s
checks / test (3.11, lowest-direct, windows-latest)	2m 39s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 6s
checks / test (3.14, locked, windows-latest)	3m 36s
checks / test (3.14, lowest-direct, windows-latest)	3m 18s
all-green	4s
	41m 48s

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