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

Also, you are missing
` .values()` 

For reference, please see:
https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Map


## Properties
 * Map.prototype
 * Map.prototype.size
 * Map.prototype[@@toStringTag]
* get Map[@@species]

## Methods
* Map.prototype.clear()
*Map.prototype.delete()
* Map.prototype.entries()
* Map.prototype.forEach()
* Map.prototype.get()
* Map.prototype.has()
* Map.prototype.keys()
* Map.prototype.set()
* Map.prototype.values()
* Map.prototype[@@iterator]()

Or maybe we can make this a set:
https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Set


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