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Advanced usage. Solver-specific parameters in the solver's own format,
different for each solver. For example, if you use SCIP and you want to
stop the solve earlier than the time limit if it reached a solution that is
at most 1% away from the optimal, you can set this to "limits/gap=0.01".
Note however that there is no "security" mechanism in place so it is up to
the client to make sure that the given options don't make the solve
non thread safe or use up too much memory for instance.
If the