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The :class:`.TypeDecorator` class will now emit a warning when used in SQL compilation with caching unless the ``.cache_ok`` flag is set to ``True`` or ``False``. ``.cache_ok`` indicates that all the parameters passed to the object are safe to be used as a cache key, ``False`` means they are not. Fixes: #6436 Change-Id: Ib1bb7dc4b124e38521d615c2e2e691e4915594fb