SplitFunction W_prototype fixes #334

Job	Run time
Tests (1, Core) / Tests - Core	11m 59s
Tests (1, Downstream) / Tests - Downstream	12m 7s
Tests (1, Python) / Tests - Python	12m 2s
Tests (1, QA) / Tests - QA	12m 20s
Tests (lts, Core) / Tests - Core	7m 58s
Tests (lts, Python) / Tests - Python	12m 48s
Tests (lts, Downstream) / Tests - Downstream	18m 1s
Tests (lts, QA) / Tests - QA	7m 54s
Tests (pre, Core) / Tests - Core	12m 32s
Tests (pre, Python) / Tests - Python	12m 17s
Tests (pre, Downstream) / Tests - Downstream	12m 8s
Tests (pre, QA) / Tests - QA	12m 1s
	2h 24m 7s

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