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DependencyHelper (the solvers in general) behave differently when units are set first or set last
The DependencyHelper behavior can look strange to newcomer since its behavior depends of the order of the constraints.
SAT power users use that order to let the solver perform as much simplification as possible.
Here, we receive an exception when the constraints are simplified.
Several options are available:
- do not fix, its a feature, not a bug
- fix be ignoring simplified constraints => no more control of what's going on in the helper, might be error prone
- fix by delegating unit to be the last thing added to the solver: the helper acts as a proxy here. => no more power user control of the helper.
Need to think about it.