Tests

Merge pull request #557 from ChrisRackauckas-Claude/fix-fb-serial #403

Job	Run time
Tests (pre, Core) / Tests - Core	28s
Tests (1, nopre) / Tests - nopre	31s
Tests (1, Core) / Tests - Core	37s
Tests (lts, Downstream) / Tests - Downstream	38s
Tests (lts, Core) / Tests - Core	38s
Tests (1, Downstream) / Tests - Downstream	38s
Tests (pre, Downstream) / Tests - Downstream	53s
Tests (lts, nopre) / Tests - nopre	40s
	5m 3s

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