Sebastian Bogan

[`DescendantsWalker()`](https://github.com/heimdalr/dag/blob/1ec50306dc1a3d6440573c35729ac5fc76dff0ec/dag.go#L781) and [`BFSWalk()`](https://github.com/heimdalr/dag/blob/1ec50306dc1a3d6440573c35729ac5fc76dff0ec/visitor.go#L51) partially overlap.

Memory Usage

5

another stuff that over allocate memory (i'm run benchmark for 100000 count) can we lower the memory usage? ``` ROUTINE ======================== github.com/heimdalr/dag.(*DAG).AddEdge in /home/vtolstov/.cache/go-path/pkg/mod/github.com/heimdalr/dag @v0.9.11/dag.go 252.53MB 596.07MB (flat, cum) 23.62%...

Add an option that allow to disable caching.