refactor(lib): resolve FIXME messages #2207

Job	Run time
Verify hyper.h is up to date	50s
Check Style	8s
features	35s
Test with Miri	1m 25s
Test C API (FFI)	51s
Check MSRV	4m 46s
Test stable on ubuntu-latest	2m 8s
udeps	37s
Test stable on windows-latest	5m 13s
Test stable on macOS-latest	2m 25s
Test beta on ubuntu-latest	2m 14s
Test beta on windows-latest	3m 48s
Test beta on macOS-latest	2m 6s
Test nightly on ubuntu-latest	2m 12s
Test nightly on windows-latest	3m 29s
Test nightly on macOS-latest	3m 11s
Build docs	30s
Check exposed types	31s
CI is green	2s
	37m 1s

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