Use Case

For large schemas, being able to extend top level types like Query and Mutation would be nice to have so as to modularize schemas for large projects.

Current State

It is currently possible to extend a type once like so:

type Query {
   aField: AType
}

# potentially in another file
extend type Query {
   bField(someArg: SomeType): SomeDomainSpecificType
}

Attempting to add one more extend type results in an error.

Desired State

It would be preferable if the library supported any number of type extensions. This will enable applications with medium / large schemas to separate their types by domain and use-case.