[heycam/webidl] Promise handling algorithms are not very clear about what happens if type conversion fails (#782)

https://heycam.github.io/webidl/#dfn-perform-steps-once-promise-is-settled

What if the type is `Promise<Node>` and someone passes `Promise.resolve(3)`?

I think the best we can do is go down the rejection path? Although that makes using "upon fulfillment" in isolation pretty dangerous for non-`any` _T_s.

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https://github.com/heycam/webidl/issues/782