docs: def satisfiable(self, extra_constraints=(), exact=None):
          """
          This function does a constraint check and checks if the solver is in a sat state.
  
          :param extra_constraints:   Extra constraints (as ASTs) to add to s for this solve
          :param exact:               If False, return approximate solutions.
  
          :return:                    True if sat, otherwise false
          """
          if exact is False and o.VALIDATE_APPROXIMATIONS in self.state.options:
              er = self._solver.satisfiable(extra_constraints=self._adjust_constraint_list(extra_constraints))
              ar = self._solver.satisfiable(extra_constraints=self._adjust_constraint_list(extra_constraints), exact=False)
              if er is True:
                  assert ar is True
              return ar
          return self._solver.satisfiable(extra_constraints=self._adjust_constraint_list(extra_constraints), exact=exact)