[Someone]

Looked for a spec, but couldn’t find it, so here’s a _guess_: there’s significant whitespace between the colon and the opening brace:

  age:{int, min:20},
  address: {street, city, state}

Alternatively, there may be a set of forbidden field names, including bool, int and string.

Of these two, I like neither, but would opt for the latter.

I also considered that min:20 implied the previous had to be a type, but I don’t see how that’s consistent with

  active?:bool

and

  tags?:[string]