rust_subset_genes() — HashSet-based gene filtering, O(n+m) vs R's O(n×m)rust_wilcoxon_filter() — parallel Wilcoxon rank-sum test with tie correction
using Rayon, 183x faster than base R on 2,000 genes × 200 cellsrust_match_lr_pairs() — HashSet-based ligand-receptor pair matchingCellChatDB.human (3,233 interactions)