stream: align Readable.toWeb termination with eos #4581

Job	Run time
Build slim tarball	1m 57s
x86_64-darwin: with shared libraries	27m 39s
aarch64-linux: with shared libraries	18m 23s
x86_64-linux: with shared libraries	21m 54s
aarch64-darwin: with shared libraries	18m 9s
	1h 28m 2s

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