stream: don't try to read more if reading #304

Job	Run time
Build slim tarball	1m 28s
x86_64-darwin: with shared libraries	43m 57s
x86_64-linux: with shared libraries	28m 25s
aarch64-darwin: with shared libraries	23m 22s
aarch64-linux: with shared libraries	24m 27s
	2h 1m 39s

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