code: def typed_mutate(self, seed_input: Dict):
      if len(seed_input) == 0:
          return self.typed_gen(dict())
  
      choice = random.randint(1, 2)
      if choice == 1:  # add a kv
          k = self.typed_mutate(random.choice(list(seed_input.keys())))
          v = self.typed_mutate(
              random.choice(list(seed_input.values()))
          )
          seed_input[k] = v
      elif choice == 2:  # inplace value change
          k0, v0 = random.choice(list(seed_input.items()))
          seed_input[k0] = self.typed_mutate(v0)
      return seed_input
  
imports: import copy
  import math
  import random
  import string
  from typing import Any, Dict, List, Optional, Set, Tuple
  from multipledispatch import dispatch
  from rich.progress import track
  from evalplus._experimental.evaluate_runtime import MAX_WARMUP_LIMIT, RUN_REPEAT, execute_for_runtime
  from evalplus.gen.mut_gen import MutateGen
label_desc: Use image node_id 21 for calling the TypedMutEffGen obj's underlying member method code with example usage: obj.typed_mutate(seed_input) and returns: seed_input, self