Fix bounds breaking change. #345

Job	Run time
set-image	1s
checks	1m 12s
tests	1m 49s
clippy	1m 6s
bench-rust-nightly (bit-vec)	14m 50s
fmt	52s
bench-rust-nightly (bytes)	14m 49s
bench-rust-nightly (generic-array)	14m 50s
miri (bit-vec)	14m 48s
bench-rust-nightly (derive)	14m 50s
miri (bytes)	3m 9s
bench-rust-nightly (max-encoded-len)	14m 48s
miri (generic-array)	3m 5s
miri (arbitrary)	3m 10s
build-linux-ubuntu-amd64	53s
publish-dry-run	1m 1s
	1h 45m 13s

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