Ports testInstanceOf.js and adds the doInstanceOf binding: napi_instanceof must agree with the instanceof operator, including when a constructor overrides Symbol.hasInstance.
Upstream guards the whole file on Symbol.hasInstance existing; dropped, since the CTS targets engines where it is guaranteed.
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Ports testInstanceOf.js and adds the doInstanceOf binding: napi_instanceof must agree with the instanceof operator, including when a constructor overrides Symbol.hasInstance.
Upstream guards the whole file on Symbol.hasInstance existing; dropped, since the CTS targets engines where it is guaranteed.
Stacked on #72 - review that first.