refactor(lib): resolve FIXME messages (#3348) #2228

Job	Run time
Verify hyper.h is up to date	37s
Check Style	8s
Test C API (FFI)	32s
Test with Miri	1m 46s
features	17s
Check MSRV	41s
udeps	50s
Test stable on ubuntu-latest	1m 29s
Test stable on windows-latest	4m 32s
Test stable on macOS-latest	1m 38s
Test beta on ubuntu-latest	1m 40s
Test beta on windows-latest	2m 54s
Test beta on macOS-latest	1m 25s
Test nightly on ubuntu-latest	2m 37s
Test nightly on windows-latest	4m 34s
Test nightly on macOS-latest	3m 7s
Check exposed types	26s
Build docs	34s
CI is green	2s
	29m 49s

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