Measured (Release, 7x9 solid hull -- the LonginusX shipped-hull fixture the
brief named is not available to this test file):
- Lane: 0 B / 1000 calls (was: 64 B/call from Array.Sort's comparer wrapper;
now confirmed 0 after the earlier IComparable<T> change in this batch).
- Silhouette (caller-supplied buffer): 0 B / 1000 calls.
- HitProbability, gated in (a real, non-gated-out call): ~120 B/call. This is
NOT from Lane, Silhouette or the comparer -- it comes from Accuracy/
Resolution's own GetBehavior<T>, which walks Entity.Equipment and each
item's Behaviors (both ReactiveCollection<T>); that type's enumerator is
heap-allocated per foreach. This predates Cut 12.2 and is out of this cut's
scope to fix.
- Inspect, gated in: ~280 B/call (same cause, more GetBehavior<T> calls).
The Forecast comment claiming "the forecast path (HitProbability, Inspect) no
longer allocates on a gated-in call" was not true and is corrected to say what
was actually measured: Silhouette itself is allocation-free given a pooled
buffer, and the residual cost belongs to Entity's own collection choice.
LaneAndSilhouetteAllocateNothingGivenAPooledBuffer asserts the true zero-alloc
claims exactly and records (with a loose regression bound, not a false zero)
the unrelated Entity-level cost on the full HitProbability path.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
ca1670a216