stream: improve Web Compression spec compliance #3934

Job	Run time
Build slim tarball	1m 47s
aarch64-darwin: with shared libraries	17m 48s
aarch64-linux: with shared libraries	19m 20s
x86_64-linux: with shared libraries	23m 43s
x86_64-darwin: with shared libraries	26m 24s
	1h 29m 2s

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