After an interesting discussion about a nice Java interop feature where you can allow Java callers to pass in

null

in place of default parameters to have the default values substituted in automatically, I went on and implemented that in a compiler plugin. This might be useful for someone (I guess), even as a starting stone into learning compiler plugins. Any feedback or criticism is very recommended 😄

What if parameter is of nullable type, but default value is different from null?

Currently, it just replaces null with the default value even if the type is nullable. However, that behaviour probably isn't the most correct I would say. It's just kind of difficult to determine what the correct and least surprising behaviour should be here