[Autoloop: tsb-perf-evolve] Iteration 69: extract cold sort path to _sortValuesCold for inlining

Run: https://github.com/githubnext/tsb/actions/runs/26792944161

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: github-actions[bot]

src/core/series.ts

@@ -760,18 +760,20 @@ export class Series<T extends Scalar = Scalar> {
     // ── Per-instance cache: named properties for direct access on the hot path ──
     // Eliminates the O(n) gather loop, inverse-transform, RangeIndex construction,
     // and Object.freeze spreads on all repeat calls with the same parameters.
+    // The public method is kept tiny (~12 lines) so V8/Bun can inline it at all
+    // call sites, collapsing the hot (cache-hit) path to a single property read.
     if (ascending) {
       const hit = naPosition === "last" ? this._svCacheAL : this._svCacheAF;
-      if (hit !== null) {
-        return hit;
-      }
+      if (hit !== null) return hit;
     } else {
       const hit = naPosition === "last" ? this._svCacheDL : this._svCacheDF;
-      if (hit !== null) {
-        return hit;
-      }
+      if (hit !== null) return hit;
     }
+    return this._sortValuesCold(ascending, naPosition);
+  }
 
+  /** Cold path: full LSD radix sort, gather loop, cache store. Only called once per (ascending, naPosition) pair. */
+  private _sortValuesCold(ascending: boolean, naPosition: "first" | "last"): Series<T> {
     const n = this._values.length;
     const vals = this._values;