Re: [w3c/payment-handler] Should PaymentInstruments.set() be immutable? (#285)

> I'm not sure but the I believe that instrument.set() will take a copy of capabilities object.

Spec does not say that object is cloned, serialized, etc. 
`8. Otherwise, insert the PaymentInstrument in details as a new member of the collection and associate it with the key instrumentKey`

@romandev If I remember correctly IDL dictionaries, primitives, sequences, etc., are passed by value, `object`s and interface objects by reference. Maybe someone could write WPT test, to make sure there are no side effects.

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