class_docstr: A dictionary-like object that welcomes guests without reservations and
  adds them to the end of the guest list.
class_docstr_tok: ["A","dictionary-like","object","that","welcomes","guests","without","reservations","and","adds","them","to","the","end","of","the","guest","list","."]
code: def __init__(self, lst):
      self.l = lst
      self.s = set(id(v) for v in lst)
  
imports: from fontTools.misc.timeTools import timestampNow
  from fontTools.ttLib.tables.DefaultTable import DefaultTable
  from functools import reduce
  import operator
  import logging
label_desc: Use image node_id 1 to create a new GregariousIdentityDict object from inherited base classes: object with example: obj = GregariousIdentityDict(lst)