Re: [w3c/payment-handler] Ability to set default instrument for given handler (#173)

That works. So defining a default also means defining a second key for that instrument.

In terms of the API would a design where I don't repeat the same instrument twice be better? Perhaps change first bullet to:

* The PaymentInstrument dictionary includes an optional attribute: defaultInstrumentKey (string). At most one instrument may have a value for defaultInstrumentKey within the scope of
PaymentManager.PaymentInstruments or within the scope of a PaymentWallet.

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