stream: improve Web Compression spec compliance #3931

Job	Run time
Build slim tarball	2m 10s
aarch64-darwin: with shared libraries	22m 55s
x86_64-linux: with shared libraries	25m 18s
x86_64-darwin: with shared libraries	32m 56s
aarch64-linux: with shared libraries	20m 26s
	1h 43m 45s

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