Re: [heycam/webidl] Way to mark a method as "async" (#214)

This is already provided by Web IDL. Returning a promise type implicitly transforms any throws to rejections and returns to fulfillments: https://heycam.github.io/webidl/#dfn-create-operation-function step 2. I think it's bad practice to be implicit in this way though.

I think the awaiting construct you describe is not good. It's mixing up two things: in parallel, and promises. You shouldn't be able to await non-promises. If you want to await promises, use https://heycam.github.io/webidl/#dfn-perform-steps-once-promise-is-settled; if you want to wait until things run in parallel, just "Wait, in parallel".

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