Weird behavior for Policy::minimum_n_keys

[danielabrozzoni]

minimum_n_keys returns 0 when it encounters Policy::Unsatisfiable, this leads to some strange behavior with policies such as:

or(UNSATISFIABLE,and(pkh(alice_pkh),pkh(bob_pkh)))

where minimum_n_keys returns 0, even though the minimum number of keys for satisfying that policy is 2.

[sanket1729]

This is indeed a bug. I think we should update the method to return an option.

[danielabrozzoni]

I agree, even though returning an Option might make the code a bit messier.
Can I try working on this? :)

[sanket1729]

Yes, all yours :)