Expand description
Fast hash-map aliases for hot-path collections.
stdlib HashMap uses SipHash-1-3. For the short string keys that dominate
WS state (asset IDs, market IDs, outcome names) ahash is ~3-5x faster on
insert/lookup and DoS-resistance is not a concern for internal state.
Usage is opt-in — don’t force-migrate every HashMap; use this only where
profiling shows hashing in the top of the flamegraph.