code: function thunks(a, b, patch, index) {
      var nodes = handleThunk(a, b);
      var thunkPatch = diff(nodes.a, nodes.b)
      if (hasPatches(thunkPatch)) {
          patch[index] = new VPatch(VPatch.THUNK, null, thunkPatch)
      }
  }
docs: Create a sub-patch for thunks