[h4l]

Glad to hear, this was something I wanted to make reliable, ergonomic and intuitive. I figured a lot of languages use `: type` to declare types.

The same using jo would be like this, which I find harder to type and remember:

  jo -- -s id=42 -n size=42 -s surname=null data=null
  {"id":"42","size":42,"surname":"","data":null}

Notice that surname comes out as the empty string though, I think this must be a bug in jo!