satisfy constraint for keyed behavior

Author: gr0uch

frameworks/keyed/s2/src/bench.js

@@ -75,6 +75,15 @@ var id = 0
 function create (label, number) {
   return function () {
     bench(label, function () {
+      // Technical note: the keyed behavior for array replacement can be forced
+      // by resetting it first. Removing this would default to non-keyed behavior.
+      //
+      // This *could* be the default behavior in the library itself, but would be
+      // a de-optimization for the common use case of replacing an array with another.
+      // Even if the default behavior was keyed, non-keyed could still be forced by
+      // mutating objects in the array.
+      proxy.rows = null
+
       proxy.rows = buildData(number)
     })
   }