Re: [w3c/payment-request] Modifiers and [[serializedModifierData]] not actually used anywhere. (#753)

> I remain convinced that serializing and passing to the payment handler spec is the right way to spec that property.

I don't mind so much (specially if a payment handler `JSON.parse()`s on the other end) - but we still have the problem that you get the wrong data. That's fixable by using  `tuple(PMI, serializedData)` - as it's done with `[[serializedMethodData]]`.

But the larger question of conversion kinda remains, as does `[[serializedModifierData]]` not actually being applied. 

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