code: def test_cross_barrier(self):
      m = nnx.Dict(a=nnx.Param(1))
  
      @jax.jit
      def g(state: nnx.State, graphdef: nnx.GraphDef[nnx.Dict[int]]):
          m = graphdef.merge(state)
          m.a += 1
          return m.split()
  
      state, graphdef = g(*m.split())
      m2 = graphdef.merge(state)
      assert m2 is not m
      assert m.a == 1
      assert m2.a == 2
  
imports: import dataclasses
  from copy import deepcopy
  from typing import Any, TypeVar
  import jax
  import jax.numpy
  import pytest
  from flax.experimental import nnx
label_desc: Use image node_id 12 for calling the TestModule obj's underlying member method code with example usage: obj.test_cross_barrier() and returns: m