Node field type [uid] doesn't work through Repo

[mangr3n]

Maybe I'm not understanding how this is supposed to work, but this doesn't work

test "setting uid fields" do
  user = %User{name: "George", age: 52}
  assert {:ok, %User{uid: uid}} = TestRepo.set(user)

  friend = %User{name: "David", age: 48, friends: [uid]}
  assert {:ok, %User{uid: new_uid}} = TestRepo.set(friend)
end

test "setting uid fields in changeset" do
  changeset = Ecto.Changeset.cast(%User{}, %{name: "George", age: 52}, [:name, :age])
  assert {:ok, %User{uid: uid}} = TestRepo.set(changeset)


  friendset = Ecto.Changeset.cast(%User{}, %{name: "David", age: 48, friends: [uid]}, [:name, :age, :friends])
  assert {:ok, %User{uid: new_uid}} = TestRepo.set(friendset)
end

Errors:

1. test schema operations setting uid fields (Dlex.RepoTest)
   test/dlex/repo_test.exs:39
   match (=) failed
   code: assert {:ok, %User{uid: new_uid}} = TestRepo.set(friend)
   left: {:ok, %Dlex.User{uid: new_uid}}
   right: {:error, %Dlex.Error{exception: true, action: :execute, reason: %GRPC.RPCError{message: "Input for predicate "user.friends" of type uid is scalar. Edge: entity:11063 attr:"user.friends" value:"0x2b36" value_type:STRING ", status: 2}}}
   stacktrace:
   test/dlex/repo_test.exs:44: (test)

2. test schema operations setting uid fields (Dlex.RepoTest)
   test/dlex/repo_test.exs:39
   match (=) failed
   code: assert {:ok, %User{uid: new_uid}} = TestRepo.set(friend)
   left: {:ok, %Dlex.User{uid: new_uid}}
   right: {:error, %Dlex.Error{exception: true, action: :execute, reason: %GRPC.RPCError{message: "Input for predicate "user.friends" of type uid is scalar. Edge: entity:11092 attr:"user.friends" value:"0x2b53" value_type:STRING ", status: 2}}}
   stacktrace:
   test/dlex/repo_test.exs:44: (test)