refactor: roll out stream helpers to unbound spec (#1090) #3690

Job	Run time
compile	2m 16s
platform-unit-test (windows-latest)	10m 33s
knip	51s
invisible-chars	6s
check-translations	52s
platform-unit-test (ubuntu-latest)	3m 55s
dependency-review	0s
	18m 33s

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