domenic requested changes on this pull request.
So it's better to stay at the Infra level than to drop down to the ECMAScript level. Otherwise what happens here will be different if someone monkeys with Object.prototype, for example. You'll need to define some kind of ordered map merging operation, or let us do that for you in Infra.
BUT, as I pointed out in https://github.com/w3c/payment-request/issues/649#issuecomment-359108225, I don't think this patch is necessary at all. Let's continue discussing there.
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