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

> In the spec as written, it'll return a rejected promise and the success steps won't be run.

Ah, I guess because "converting" will throw, and PerformPromiseThen handles it. That makes sense.

> This suggests to me that we should run the rejection steps on conversion failure.

Sounds good to me.

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