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epriestley authored
Summary: Ref T13222. Ref T12588. See PHI683. To make "Create Subtask..." fancier, we need slightly more logic around subtype maps. Upgrade the plain old array into a proper object so it can have relevant methods, notably "get a list of valid child subtypes for some parent subtype". Test Plan: Created and edited tasks, changed task subtypes. Grepped for affected symbols (`newEditEngineSubtypeMap`, `newSubtypeMap`). Reviewers: amckinley Reviewed By: amckinley Maniphest Tasks: T13222, T12588 Differential Revision: https://secure.phabricator.com/D19852
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