Tests

feat: Implement `recursivecopy` for structs #176

Job	Run time
Tests (lts, Core) / Tests - Core	4m 31s
Tests (pre, Downstream) / Tests - Downstream	32s
Tests (lts, Downstream) / Tests - Downstream	9m 22s
Tests (pre, Core) / Tests - Core	6m 1s
Tests (1, Core) / Tests - Core	6m 22s
Tests (1, Downstream) / Tests - Downstream	17m 4s
	43m 52s

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