Re: [w3c/browser-payment-api] Currency Types and Rendering (#185)

> To be even more precise: it would be invalid to use a string of (length == 3) unless it is an assigned ISO code.

+1 to this -- if we don't, could be a pretty financially costly mistake when ISO defines a code that was in use w/this API as some other non-ISO currency.

I still think we should be using ISO or URLs -- what if ISO adopts four letters in the future? I doubt they will adopt URLs, but if they do, that's not a problem. This is the Web -- we should be using URLs for identifiers.

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