feat(inspect): `refs` #4407

Job	Run time
unit	12m 19s
build_with_no_default_features (ubuntu-latest)	30s
build_with_no_default_features (macos-latest)	51s
Verify MSRV	3m 0s
build_with_no_default_features (windows-latest)	2m 41s
check (ubuntu-latest)	3m 52s
check (macos-latest)	3m 39s
build (ubuntu-latest)	1m 40s
build (macos-latest)	2m 33s
build (windows-latest)	4m 30s
	35m 35s

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