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Keep unknown keys on client and server capabilities #4617

Job	Run time
checks / docs	1m 2s
checks / test (3.13, locked, windows-latest)	2m 24s
checks / readme-snippets	13s
checks / pre-commit	59s
checks / test (3.12, locked, windows-latest)	2m 29s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 34s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 9s
checks / test (3.11, locked, windows-latest)	1m 59s
checks / test (3.15, lowest-direct, windows-latest)	1m 37s
checks / test (3.13, lowest-direct, windows-latest)	2m 14s
checks / test (3.11, locked, ubuntu-latest)	1m 28s
checks / test (3.15, lowest-direct, ubuntu-latest)	1m 12s
checks / test (3.12, locked, ubuntu-latest)	1m 12s
checks / test (3.11, lowest-direct, windows-latest)	2m 22s
checks / test (3.14, locked, windows-latest)	2m 10s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.14, locked, ubuntu-latest)	1m 30s
checks / test (3.13, locked, ubuntu-latest)	1m 35s
checks / test (3.14, lowest-direct, windows-latest)	2m 10s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 18s
checks / test (3.12, lowest-direct, windows-latest)	2m 41s
checks / test (3.15, locked, ubuntu-latest)	1m 31s
checks / test (3.15, locked, windows-latest)	1m 54s
all-green	3s
	37m 51s