docs: def booleanise(b):
      """Normalise a 'stringified' Boolean to a proper Python Boolean.
  
      ElasticSearch has a habit of returning "true" and "false" in its 
      JSON responses when it should be returning `true` and `false`.  If 
      `b` looks like a stringified Boolean true, return True.  If `b` 
      looks like a stringified Boolean false, return False.
  
      If we don't know what `b` is supposed to represent, return it back 
      to the caller.
  
      """
      s = str(b)
      if s.lower() == "true":
          return True
      if s.lower() == "false":
          return False
  
      return b