documentation VS purescript-argonaut-codecs

The example from the PureScript documentation is:

Filippo: With Haskell knowledge, reading PureScript documentation was enough.

See https://github.com/purescript/documentation/blob/master/errors/TypesDoNotUnify.md for more information, or to contribute content related to this error.

[1 of 1] Compiling Main Error found: in module Main at src/Main.purs:40:35 - 40:39 (line 40, column 35 - line 40, column 39) Could not match type { age :: Maybe Int , name :: String , team :: Maybe String} with type Json while checking that type t0 is at least as general as type Json while checking that expression user has type Json in value declaration main where t0 is an unknown type See https://github.com/purescript/documentation/blob/master/errors/TypesDoNotUnify.md for more information, or to contribute content related to this error. [error] Failed to build.)

I'm trying to get a better grasp on the type system of purescript. One thing I'm struggling to fully understand is how the so-called "kind system" works. The language reference is very brief about it.

purescript uses (_ - 5) for that operator section, which i'm not a total fan of, but it's at least unambiguous; agda would write it as _- 5

The one page you should add to the documentation is "differences from Vim".

For example, https://github.com/purescript/documentation/blob/master/lang... makes picking up PureScript as a Haskell programmer much easier than having to read all of the documentation and do the diff yourself.

More info can be found here: https://github.com/purescript/documentation/blob/master/guides/Getting-Started.md

I am trying to recreate the basic examples from the purescript-argonaut-codecs package. My Main.purs is like