docs: def is_filelike(ob):
      """Check for filelikeness of an object.
  
      Needed to distinguish it from file names.
      Returns true if it has a read or a write method.
      """
      if hasattr(ob, 'read') and callable(ob.read):
          return True
  
      if hasattr(ob, 'write') and callable(ob.write):
          return True
  
      return False