empty nodes are nil in unmarshal. this makes sense to me, but has caused me inconvenience and i wondered if it made sense to put an empty interface there. when using unmarshal, kdl behaved differently than the others when looking at koanf

i believe there might be something in kdl specs that says the data model or something agrees with what you've done, i just, wanted to note this issue here and maybe i'm doing something wrong.

https://github.com/developing-today-forks/koanf/pull/1/files