@type pullrequest() :: %{
  optional(:author) => user(),
  optional(:id) => integer(),
  optional(:repository) => repository(),
  optional(:title) => String.t()
}

@type repository() :: %{optional(:owner) => user(), optional(:slug) => String.t()}

@type user() :: %{optional(:username) => String.t(), optional(:uuid) => String.t()}