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93cfb49572
Fixed issue where a :class:`.MetaData` collection would not be serializable, if an :class:`.Enum` or :class:`.Boolean` datatype were present which had been adapted. This specific scenario in turn could occur when using the :class:`.Enum` or :class:`.Boolean` within ORM Annotated Declarative form where type objects frequently get copied. Fixes: #11365 Change-Id: Iaaa64baad79c41075d37cf53dade744d79e600a3