Re: [browser-payment-api] Write-up proposal for shipping address fields (#6)

Checking for attributes isn't crude feature detection - it's most likely the best type of feature detection. By having an interface in the type system, you can interrogate the presence of attributes at run time. A dictionary returned by a method is indistinguishable from a JavaScript object (in our implementation it is simply a JavaScript object) and you can't infer anything from it.

So if we add new attributes in future and I want to be able to tell if my code is running in a browser that supports those new attributes then I need an interface to interrogate.

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https://github.com/w3c/browser-payment-api/issues/6#issuecomment-195554240