Re: [w3c/payment-handler] PaymentManager behavior unclear (#253)

Also confused by this, while working on a proof of concept with "just in time" installation, I tried setting up instruments from inside the service worker `self.registration.paymentManager.instruments.set(..., ...)`, specifically in the `paymentrequest` event callback, but the browser tab crashes on chrome when doing so (couldn't find any meaningful error from it when debugging).

It's not clear to me `when` and `where` it's possible to set instruments besides the common example...

Maybe it would be nice to have a list of use cases ⁄ scenarios on the spec 🤷‍♂️ 

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