Subject: | Partial specify_behavior |
It would be useful to be able to call specify_behavior/set_behavior with only some keys, so that we can change only a specific case from some default values, without having to give again all cases.
The specific case I had in practice was that i needed to have right_precedent semantic except for one case (array/array merge), and I would have prefered to override only my new case, without having to respecify everything already done in right_precedent.