Are you tired of coins launching everywhere when you kill golden slimes or break golden pots? Or what about when the bandit box snipes an odd crate or two and lowers your discount through no fault of your own? Or maybe even when the odd treasure chest catapults a few precious coins into a pit when you were SO CLOSE TO AFFORDING THAT BAT EAR?!?!?! I have an easy solution.
Add some new coin types that are worth more to lower the number of items stored in objects.
The most common amount seems to be 5, but add a coin that gives 10 too. These would remedy the issue of having too many coins shoved into one spot and turning into a particle accelerator that melts down when the container is broken.