Tests

Merge pull request #568 from ChrisRackauckas-Claude/polyester-threadi… #420

Job	Run time
Tests (1, Downstream) / Tests - Downstream	3m 14s
Tests (1, Core) / Tests - Core	6m 53s
Tests (pre, Downstream) / Tests - Downstream	3m 17s
Tests (lts, Core) / Tests - Core	5m 28s
Tests (1, nopre) / Tests - nopre	6m 22s
Tests (lts, nopre) / Tests - nopre	3m 9s
Tests (lts, Downstream) / Tests - Downstream	1m 50s
Tests (pre, Core) / Tests - Core	6m 20s
	36m 33s

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