code: def unpatch_locals(depth=3):
      
      for name, locals_dict in traverse_local_prefs(depth):
          if isinstance(locals_dict[name], PatchedLocal):
              locals_dict[name] = locals_dict[name].val
  
      del get_frame_locals(depth)[__PATCHED_LOCALS_SENTINEL]
docs: Restores the original values of module variables
      considered preferences if they are still PatchedLocal
      and not PrefProxy.