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Jeremy Reizenstein authored
Summary: A new type of auto-expanded member of a Configurable: something of type Optional[X] where X is a Configurable. This works like X but its construction is controlled by a boolean membername_enabled. Reviewed By: davnov134 Differential Revision: D35368269 fbshipit-source-id: 7e0c8a3e8c4930b0aa942fa1b325ce65336ebd5f
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