Re: [heycam/webidl] Referencing "implements" (#659)

I cannot really use this. Whenever we operate on algorithms they're no longer ECMAScript values. I need the equivalent check for IDL values. I suspect this applies to all specifications that use IDL. Or do we expect specifications to say something like:

> If node's corresponding ECMAScript value implements `Text`, then ...

?

It seems IDL could maybe use something similar to assert that a specification algorithm returns a thing compatible with the IDL fragment?

(It might be nice if IDL values were standardized a bit more so "corresponding ECMAScript value" was a defined term too.)

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