Editorial: Added more missing cases for ExpectedArgumentCount for FormalParameters and FormalParameterList #1662
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FormalParameterList is either 1) “FormalParamer" or 2) "FormalParameterList , FormalParameter”.
However, for ExpectedArgumentCount, only "FormalParameterList , FormalParameter” is defined
but “FormalParameter” is not defined. According to the NOTE, it might be 0 if it has initializer.
Otherwise, it might be 0. I think it also should be formally defined like other semantics.
In a similar way, there is no semantics of ExpectedArgumentCount for "FormalParameters : FormalRestParameter” and “FormalParameters : FormalParameterList , “. Thus, I changed the spec to cover all cases I mentioned above.