Re: [w3c/browser-payment-api] Spec prohibits currency validation but doesn't define what it is (#175)

It may be useful to be more explicit about conformance requirements from an "author" perspective and from an "implementation" perspective. What do you think of this change:

 "Developers SHOULD identify currencies with the three-letter codes defined in [ISO4217]. User agents MUST NOT treat other values as errors because developers MAY identify currencies in other ways."

Ian

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