Duplicate input types for GraphQL

defmodule Package
  attributes do
     attribute :options, {:array, Option}, allow_nil?: false
  end

  graphql do
    type :package
    mutations do
      create :create
      update :add_option, :add_option, identity: :key
    end
  end

  actions do
    defaults [:create]

    update :add_option do
      accept []
      argument :option, Option, allow_nil?: false
      ...
    end
  end

Type name "OptionString" is not unique.

References to types must be unique.