fix: Shr impl #773

Job	Run time
Clippy	47s
Cargo deny check	33s
Coverage	5m 48s
Docs	46s
Fmt	12s
test (stable, --no-default-features)	1m 18s
Feature checks	36s
test (stable)	2m 33s
test (stable, --all-features)	3m 48s
test (beta, --no-default-features)	1m 29s
test (beta)	1m 29s
test (beta, --all-features)	3m 26s
test (nightly, --no-default-features)	2m 0s
test (nightly)	1m 53s
test (nightly, --all-features)	4m 26s
test (1.65, --no-default-features)	17s
test (1.65)	24s
Accept	1s
	31m 46s

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