[The spec says](https://w3c.github.io/browser-payment-api/#paymentcurrencyamount-dictionary):
> The following fields are required:
> `currencySystem`...
However, the WebIDL for `currencySystem` does not have the `required` keyword. Let's change the phrasing of the spec to make it clear that `currencySystem` is optional. The developer could, for example, not specify it, or specify `currencySystem: null` or `currencySystem: undefined`, correct?
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