fix: no-std compat #106

Job	Run time
feature-checks	18s
clippy	36s
docs	28s
fmt	12s
miri --no-default-features	3m 35s
test stable --no-default-features	24s
miri	3m 38s
test stable	24s
miri --all-features	3m 50s
test stable --all-features	39s
test beta --no-default-features	39s
test beta	40s
test beta --all-features	50s
test nightly --no-default-features	32s
test nightly	36s
test nightly --all-features	47s
test 1.75 --no-default-features	20s
test 1.75	22s
test 1.75 --all-features	28s
	19m 18s

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