Tests

Remove any/all overloads for ArrayPartition to eliminate invalidations #373

Job	Run time
Tests (lts, Downstream) / Tests - Downstream	10m 7s
Tests (lts, Core) / Tests - Core	4m 56s
Tests (1, Core) / Tests - Core	6m 35s
Tests (1, Downstream) / Tests - Downstream	17m 4s
Tests (lts, nopre) / Tests - nopre	3m 5s
Tests (1, nopre) / Tests - nopre	6m 16s
Tests (pre, Core) / Tests - Core	6m 33s
Tests (pre, Downstream) / Tests - Downstream	18m 26s
	1h 13m 2s

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