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Avoids repeated wakeup messages being sent when a TVar is written to multiple times. See comments for details. Test Plan: * Test from #15136 (will be added to stm shortly) * existing stm tests Reviewers: bgamari, osa1, erikd Reviewed By: bgamari Subscribers: rwbarton, thomie, carter GHC Trac Issues: #15136 Differential Revision: https://phabricator.haskell.org/D4961
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