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+- **Changed:**
+ The default tactic used by :g:`firstorder` is
+ :g:`auto with core` instead of :g:`auto with *`;
+ see :ref:`decisionprocedures` for details;
+ old behavior can be reset by using the `-compat 8.12` command-line flag;
+ to ease the migration of legacy code, the default solver can be set to `debug auto with *`
+ with `Set Firstorder Solver debug auto with *`
+ (`#11760 <https://github.com/coq/coq/pull/11760>`_,
+ by Vincent Laporte).