code: def _CollectTypeChecks(function, parent_type_check_dict, stack_location,
                        self_name):
    
    type_check_dict = dict(parent_type_check_dict)
    type_check_dict.update(_ParseDocstring(function))
  
    # Convert any potential string based checks into python instances.
    for key, value in type_check_dict.items():
      if isinstance(value, str):
        type_check_dict[key] = _ParseTypeCheckString(value, stack_location + 1,
                                                    self_name)
  
    return type_check_dict
docs: Collect all type checks for this function.