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which is based on the work of Andrew Santosa (see PR #295) but fixes
many bugs in that implementation. The implementation communicates
with Z3 via it's C API.
This implementation is based of the STPSolver and STPBuilder and so it
inherits a lot of its flaws (See TODOs and FIXMEs). I have also ripped
out some of the optimisations (constructMulByConstant,
constructSDivByConstant and constructUDivByConstant) that were used in
the STPBuilder because
* I don't trust them
* Z3 can probably do these for us in the future if we use the
``Z3_simplify()``
At a glance its performance seems worse than STP but future work can
look at improving this.
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