Notes:
This release adds tuple constraints along with a couple of minor features. It
also fixes a bug introduced in the previous version.
Changes:
* [#19435] Fixed a bug causing inconsistencies during BAB-search. The bug stopped the send+more=money example from working correctly.
* Fixed the "raw_bindings" and "sudoku-set" examples, which were broken by the 0.8.0 release.
* Integers can now be used to specify singleton lower and upper bounds when creating set variables.
* Added convenience methods Model#maximize! and Model#minimize! for optimizing single variables.
* Added tuple constraints for enumerations of integer and boolean variables.
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