code: def request_is_alias(item):
      """Check if an item is a valid alias.
  
      Values in ``VALID_REQUEST_VALUES`` are not considered aliases in this
      context. Only a string which is a valid identifier is.
  
      Parameters
      ----------
      item : object
          The given item to be checked if it can be an alias.
  
      Returns
      -------
      result : bool
          Whether the given item is a valid alias.
      """
      if item in VALID_REQUEST_VALUES:
          return False
  
      # item is only an alias if it's a valid identifier
      return isinstance(item, str) and item.isidentifier()
  
imports: import inspect
  from collections import namedtuple
  from copy import deepcopy
  from typing import Optional, Union
  from warnings import warn
  from ..None import get_config
  from ..exceptions import UnsetMetadataPassedError
  from ._bunch import Bunch
label_desc: Use image node_id 2 for calling a global function with example usage: request_is_alias(item) and returns: unknown, False