Decorative minecart blocks

I think we should allow players to put any block inside a minecart. You could put a diamond ore int a minecart to make your mine look better. It might not be very useful but it would add some more decorative uses for minecarts. Now I know that decoration alone is not the best reason to add a feature, so we could make some of the blocks in a minecart useful. So for example we could have a shulkerbox minecart act like a chest minecart, but when its destroyed it drops the minecart and the shulker box with the items inside.