Backport 0.14.x: is_complete_fast #2872

Job	Run time
Verify hyper.h is up to date	36s
Check Style	11s
Check MSRV (1.63)	58s
Test with Miri	2m 3s
features	33s
Check deprecated on stable	7s
Test C API (FFI)	25s
Check deprecated on beta	13s
Test stable on ubuntu-latest	1m 17s
Test stable on windows-latest	3m 33s
Test stable on macOS-latest	1m 24s
Test beta on ubuntu-latest	1m 20s
Test beta on windows-latest	2m 31s
Test beta on macOS-latest	1m 46s
Test nightly on ubuntu-latest	1m 19s
Test nightly on windows-latest	2m 33s
Test nightly on macOS-latest	1m 26s
Build docs	22s
CI is green	1s
	22m 38s

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