Improve PosTracker performance by not using the Visitor abstraction.
Improve PosTracker performance by not using the Visitor abstraction.

benjamn/recast,benjamn/recast,rwaldron/recast,kassens/recast,shumov/recast,kyldvs/recast,ersengultepe/recast,fkling/recast,stefanpenner/recast,cpojer/recast,marcioj/recast,ipeychev/recast,benjamn/recast