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

+1 to not specify how to display currencies.

>From standpoint of validation, I preferred "[A-Z]{3}" for currency codes. However, I am OK with free-form strings, including URLs, if the community decides that's for the best. I would prefer some length limit, if possible. How about 2048 bytes?

As far as URLs go, it would be nice to present them uniformly across browser vendors. However, presentation is largely out of scope of this specification. A non-normative note would be OK, right?  Something like, "If the currency code is a URL, the user agent MAY enable opening the URL for the user to inspect."

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