Test

avoid generating duplicate stream and future constructors #311

Job	Run time
Populate cache	15m 44s
Test (ubuntu-latest, x86_64-linux)	11m 32s
Test (macos-latest, arm64-macos)	13m 8s
Test (windows-latest, x86_64-windows)	27m 28s
	1h 7m 52s

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