Tests

Type-generic zeromatrix for arraypartition #139

Job	Run time
Tests (pre, Core) / Tests - Core	4m 3s
Tests (pre, Downstream) / Tests - Downstream	12m 18s
Tests (lts, Downstream) / Tests - Downstream	9m 29s
Tests (1, Downstream) / Tests - Downstream	16m 31s
Tests (lts, Core) / Tests - Core	2m 25s
Tests (1, Core) / Tests - Core	3m 21s
	48m 7s

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