Re: [heycam/webidl] Added a definition of {{StringContext}} extended attribute. (#841)

> I don't think we can achieve that without introducing a modification to the string type. A union type will always cause specs to branch on both forks of the union.

The actual operation for the TrustedXYZ though is just stringification. DOMString is already a validated value, if stars are aligned correctly. So the modification to the algoritm could just be to stringify an argument (perhaps that logic could also be provided in an extended attribute definition).

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