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Fixes bug with IndexedSet objects and the within argument

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## Fixes #3284 . ## Summary/Motivation: Indexed sets relying on other indexed sets for the within argument trigger errors in pyomo 6.7.3, whereas in pyomo 6.6.x they did not. ##...

## Summary Pyomo Set objects allow users to define their supersets for validation via the within argument. This used to be possible with indexed set too (objects (e.g., pyomo 6.6)...

Fixes failing doctests due to numpy 2.x

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Fixes #172

[BUG] solutions violating the bounds are declared feasible

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**Describe the bug** The feasibility_x method returns True for solutions that clearly violate the declared bounds. On the other hand, if I explicitly add constraints for the bounds (within the...

**Describe the bug** Tests, specifically a couple of them contained in a docstring from the _py_algorithms.py file, are failing due to the representation numbers. Numpy 2.x introduced changes in the...