Lets redefine the base ID type to use an id from an external library.

if the type referenced in .gqlgen.yml is a function that returns a marshaller we can use it to encode and decode onto any existing go type.

And the same for the unmarshaler.

Unmarshal{Typename} is only required if the scalar appears as an input.

Point is serialized as a simple array, eg [1, 2].

A custom enum that uses integers to represent the values in memory but serialize as string for graphql.