decompression: propagate size_hint when body is identity #1107

Job	Run time
cargo-hack	1m 20s
cargo-public-api-crates	24s
check-docs	1m 11s
check	46s
cargo-deny check (advisories)	21s
cargo-deny check (bans licenses sources)	21s
style	10s
test-msrv	3m 14s
test-versions (stable)	1m 23s
test-versions (beta)	1m 32s
test-versions (nightly)	1m 26s
	12m 8s

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