Tests

Merge pull request #2935 from contradict/flatten_for_complex #109

Job	Run time
Tests (Downstream) / Tests - Downstream	6m 11s
Tests (InterfaceII) / Tests - InterfaceII	7m 50s
Tests (InterfaceI) / Tests - InterfaceI	27m 20s
Tests (Extensions) / Tests - Extensions	6m 51s
Tests (RegressionI) / Tests - RegressionI	5m 46s
	53m 58s

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