Using a HashSet at the right time.
Using a HashSet at the right time.

                       Method |     Mean |     Error |    StdDev |
----------------------------- |---------:|----------:|----------:|
 OriginalTreeBuilderBenchmark | 61.32 ms | 0.8018 ms | 0.7500 ms |
  CurrentTreeBuilderBenchmark | 42.24 ms | 0.8295 ms | 1.0786 ms |

github-for-unity/Unity,github-for-unity/Unity,mpOzelot/Unity,mpOzelot/Unity,github-for-unity/Unity