Big Barry Bitcoin on Nostr: Just reading about ecash payment requests (nut18) If you specify a set of mints in ...

Just reading about ecash payment requests (nut18)

If you specify a set of mints in the request, is the sender expected to send ecash from that list of mints or can the wallet be expected to sweep the ecash into one of those mints and move on?

I don't see where the responsibility lies in that spec.