stream: minor stream/iter implementation edits #6396

Job	Run time
Build slim tarball	1m 51s
aarch64-darwin: with shared libraries	27m 42s
aarch64-linux: Cache V8 build	22s
x86_64-darwin: with shared libraries	41m 28s
x86_64-linux: with shared libraries	30m 51s
aarch64-linux: with shared openssl-1.1.1w	25m 53s
aarch64-linux: with shared openssl-4.0.0	26m 32s
aarch64-linux: with shared openssl-3.0.19	26m 59s
aarch64-linux: with shared openssl-3.6.1	27m 8s
aarch64-linux: with shared openssl-3.5.5	27m 33s
	3h 56m 19s

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