add 256-bucket variant, slower !

speci.js

@@ -8,7 +8,7 @@ function doit() {
         return {y, x};
     }
 
-    function make_random(x, y) {
+    function make_mixed(x, y) {
         if (Math.random() > 0.5) {
             return make_y_first(x, y);
         } else {
@@ -16,6 +16,21 @@ function doit() {
         }
     }
 
+    function make_randomized(x, y) {
+        let rando = (Math.random() * (2 ** 32 - 1)) | 0;
+        let buckets = 256;
+        let r = 'random' + (rando % buckets);
+        let o = {[r]: r};
+        if (Math.random() > 0.5) {
+            o.y = y;
+            o.x = x;
+        } else {
+            o.x = x;
+            o.y = y;
+        }
+        return o;
+    }
+
     const million = 1000 * 1000;
     const n = 10 * million;
 
@@ -29,7 +44,8 @@ function doit() {
 
     const x_first = bulk(make_x_first);
     const y_first = bulk(make_y_first);
-    const mixed = bulk(make_random);
+    const mixed = bulk(make_mixed);
+    const randomized = bulk(make_randomized);
 
     function time(func) {
         const start = Date.now();
@@ -68,6 +84,9 @@ function doit() {
     console.log(`** mixed`);
     demo(mixed);
 
+    console.log(`** randomized`);
+    demo(randomized);
+
 }
 
 doit();