code: def nested_update(
      this: Dict[Any, Any], that: Dict[Any, Any]
  ) -> Dict[Any, Any]:
      """Merge two nested dictionaries.
  
      Effectively a recursive ``dict.update``.
  
      Examples
      --------
      Merge two flat dictionaries:
      >>> nested_update(
      ...     {'a': 1, 'b': 2},
      ...     {'b': 3, 'c': 4}
      ... )
      {'a': 1, 'b': 3, 'c': 4}
  
      Merge two nested dictionaries:
      >>> nested_update(
      ...     {'x': {'a': 1, 'b': 2}, 'y': 5, 'z': 6},
      ...     {'x': {'b': 3, 'c': 4}, 'z': 7, '0': 8},
      ... )
      {'x': {'a': 1, 'b': 3, 'c': 4}, 'y': 5, 'z': 7, '0': 8}
  
      """
      for key, value in this.items():
          if isinstance(value, dict):
              if key in that and isinstance(that[key], dict):
                  nested_update(this[key], that[key])
          elif key in that:
              this[key] = that[key]
  
      for key, value in that.items():
          if key not in this:
              this[key] = value
  
      return this
  
label_desc: Use image node_id 1 for calling a global function with example usage: nested_update(this, that) and returns: this