fix: don't decode ZSTs #1303

Job	Run time
docs	44s
clippy	1m 3s
feature-checks	1m 28s
fmt	13s
miri --no-default-features	2m 48s
wasm	26s
miri	2m 49s
test stable --no-default-features	40s
test stable	1m 2s
miri --all-features	3m 34s
test stable --all-features	50s
test beta --no-default-features	44s
test beta	44s
test beta --all-features	54s
test nightly --no-default-features	1m 24s
test nightly	1m 21s
test nightly --all-features	1m 34s
test 1.65 --no-default-features	1m 23s
test 1.65	1m 21s
test 1.65 --all-features	1m 45s
	26m 47s

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