feat: port test_general testInstanceOf to CTS - #74
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This was referenced Aug 10, 2026
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testInstanceOf.jsand adds thedoInstanceOfbinding:napi_instanceofmust agree with theinstanceofoperator, including when a constructor overridesSymbol.hasInstance.Upstream guards the whole file on
Symbol.hasInstanceexisting; dropped, since the CTS targets engines where it is guaranteed.Stacked on #72 - review that first.