JavaScriptCollection
diff --git a/‎d3.js‎
Lines changed: 2 additions & 2 deletions b/‎d3.js‎
Lines changed: 2 additions & 2 deletions
@@ -787,7 +787,7 @@
     function bind(group, groupData) {
       var i, n = group.length, m = groupData.length, n0 = Math.min(n, m), updateNodes = new Array(m), enterNodes = new Array(m), exitNodes = new Array(n), node, nodeData;
       if (key) {
-        var nodeByKeyValue = new d3_Map(), dataByKeyValue = new d3_Map(), keyValues = [], keyValue;
+        var nodeByKeyValue = new d3_Map(), dataByKeyValue = new d3_Set(), keyValues = [], keyValue;
         for (i = -1; ++i < n; ) {
           keyValue = key.call(node = group[i], node.__data__, i);
           if (nodeByKeyValue.has(keyValue)) {
@@ -805,7 +805,7 @@
           } else if (!dataByKeyValue.has(keyValue)) {
             enterNodes[i] = d3_selection_dataNode(nodeData);
           }
-          dataByKeyValue.set(keyValue, nodeData);
+          dataByKeyValue.add(keyValue);
           nodeByKeyValue.remove(keyValue);
         }
         for (i = -1; ++i < n; ) {