[spec] Parameter properties with question marks and initializers are not clearly specified

class C {
     constructor(public x?, public y = 1) { }
}

The spec does not clearly explain whether x and y are optional properties of C. The old compiler treats them as required properties, but optional parameters. I am not sure this makes sense.

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[spec] Parameter properties with question marks and initializers are not clearly specified #541

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[spec] Parameter properties with question marks and initializers are not clearly specified #541

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