Editorial: Narrowing an assertion in SuperCall: super Arguments #3466
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In runtime semantics SuperCall: super Arguments, there is an assertion which narrows a
newTarget's type to Object. However, we know that this is always a constructor in this step, and fixing it to a constructor will resolve a mismatch between calling [Construct](https://tc39.es/ecma262/multipage/abstract-operations.html#sec-construct] at step 6.