docs: def make_hash(o):
      r"""
      Makes a hash from a dictionary, list, tuple or set to any level, that
      contains only other hashable types (including any lists, tuples, sets, and
      dictionaries). In the case where other kinds of objects (like classes) need
      to be hashed, pass in a collection of object attributes that are pertinent.
      For example, a class can be hashed in this fashion:
  
      make_hash([cls.__dict__, cls.__name__])
  
      A function can be hashed like so:
  
      make_hash([fn.__dict__, fn.__code__])
  
      References:
          http://stackoverflow.com/questions/5884066/hashing-a-python-dictionary
      """
      if type(o) == DictProxyType:
          o2 = {}
          for k, v in o.items():
              if not k.startswith("__"):
                  o2[k] = v
              o = o2
      if isinstance(o, (set, tuple, list)):
          return tuple([make_hash(e) for e in o])
      elif not isinstance(o, dict):
          return hash(o)
      new_o = copy.deepcopy(o)
      for k, v in new_o.items():
          new_o[k] = make_hash(v)
      return hash(tuple(frozenset(sorted(new_o.items()))))