fix public leak #1275

Job	Run time
clippy	33s
feature-checks	2m 6s
test stable --no-default-features	1m 1s
miri --no-default-features	2m 22s
test stable	1m 4s
wasm	33s
miri	2m 30s
test stable --all-features	1m 16s
miri --all-features	3m 3s
test beta --no-default-features	1m 0s
docs	27s
test beta	1m 1s
test beta --all-features	1m 9s
fmt	14s
test nightly --no-default-features	55s
test nightly	57s
test nightly --all-features	1m 6s
test 1.65 --no-default-features	54s
test 1.65	51s
	23m 2s

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