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

+1 to @ianbjacobs' point, which I was about to make.

1. If we care about uniqueness and don't want a known list of non-ISO currencies, all we need is ISO codes and URLs.
2. If we don't care about uniqueness, all we need is ISO codes and something like the "+XXX" format.
3. If we care about uniqueness and want a published list of non-ISO currencies, we need all three.

I'm hearing @adrianhopebailie say he doesn't care about uniqueness, which would point to option 2.

I think we're going to run into practical issues if an identical code can mean two different things in two different contexts, so I think we need either option 1 or option 3.

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