class_docstr: ExtensionDtype that may be backed by more than one implementation.
class_docstr_tok: ["ExtensionDtype","that","may","be","backed","by","more","than","one","implementation","."]
code: def __hash__(self) -> int:
      # custom __eq__ so have to override __hash__
      return super().__hash__()
  
imports: from __future__ import annotations
  from typing import TYPE_CHECKING, Any, TypeVar, cast, overload
  import numpy
  from pandas._libs import missing
  from pandas._libs.hashtable import object_hash
  from pandas._libs.properties import cache_readonly
  from pandas.errors import AbstractMethodError
  from pandas.core.dtypes.generic import ABCDataFrame, ABCIndex, ABCSeries
label_desc: Use image node_id 5 for calling the StorageExtensionDtype obj's underlying member method code with example usage: obj.__hash__() and returns: super