An event that is emitted by Solver when a new (i.e. better) lower bound of the objective is found.
The event can be intercepted by calling
Solver.on("lower bound", ...) with
"lowerBound" event name.
The event contains the new lower bound and the solving time so far.
|Duration of the solve at the time the lower bound was found, in seconds.|
|The new lower bound of the objective.|