Cauldron Dispenser Interaction

Powering a dispenser with an empty bucket facing a cauldron filled with water or lava should pull out the cauldron's contents into the bucket. Powering a dispenser with a bucket of lava or water should fill the cauldron. Powering with an empty bucket and a not full cauldron will drop the bucket. Powering with a full bucket and a full cauldron or incompatible cauldron contents will drop the bucket. Powering with a full bucket and a partially filled cauldron and compatible contents will fill the cauldron the rest of the way. This would allow for precisely calibrated and timed machines that can automatically farm water and lava. Imagine if minecarts could link up into a train, then you could make fully automated lava powered train refueling stations, and smelt things I guess.