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Implement RFC 8555 §6.7.1 subproblems #384

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Job	Run time
msrv	1m 7s
fips	1m 7s
audit	22s
lint	1m 11s
test (ubuntu-latest, stable)	1m 13s
test (ubuntu-latest, beta)	1m 25s
test (macos-latest, stable)	1m 30s
test (windows-latest, stable)	3m 43s
	11m 38s