BinPacking2D
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ktnr
Exact solutions for two-dimensional bin packing problems by branch-and-cut
Frozen sets are [sequence dependent when instantiated from lists](https://stackoverflow.com/a/51578378/5587903) but [not when instantiated from tuples or sets](https://docs.python.org/3/library/stdtypes.html?highlight=frozenset#set-types-set-frozenset)? For example, in https://github.com/ktnr/BinPacking2D/blob/3d2852a2e7ed6aa58c696d1d1886ecf6d72d0206/BinPacking.py#L589 membership is compared after adding items to the collection...
Currently they [do not work](http://yetanothermathprogrammingconsultant.blogspot.com/2021/02/2d-bin-packing-with-google-or-tools-cp.html) when chained together. Will be supported from CP-SAT v9.3: https://github.com/google/or-tools/issues/3012