Why is the benchmark incomplete?

I found it curious that you compare with 2 alternatives for performance and with java hashsets for memory usage. It would be nice to compare both performance and memory with the same 3 alternatives, else it seems you are conveniently selecting data instead of showing the right tradeoff.

No file or test is named in the issue. Start by locating the benchmark code and its existing performance, memory, and Java HashSet comparisons. Update the benchmark so both metrics use the same three alternatives, then verify that the results present comparable tradeoffs.

Written by the indexing model from the issue text.