diff --git a/d3.v2.js b/d3.v2.js
index e2c31e39..337cc409 100644
--- a/d3.v2.js
+++ b/d3.v2.js
@@ -1709,7 +1709,7 @@ d3_selectionPrototype.data = function(data, join) {
 
       for (i = -1; ++i < n;) {
         key = join.call(node = group[i], node.__data__, i);
-        if (key in nodeByKey) {
+        if (nodeByKey.hasOwnProperty(key)) {
           exitNodes[j++] = node; // duplicate key
         } else {
           nodeByKey[key] = node;
@@ -1718,8 +1718,9 @@ d3_selectionPrototype.data = function(data, join) {
       }
 
       for (i = -1; ++i < m;) {
-        node = nodeByKey[key = join.call(groupData, nodeData = groupData[i], i)];
-        if (node) {
+        key = join.call(groupData, nodeData = groupData[i], i)
+        if (nodeByKey.hasOwnProperty(key)) {
+          node = nodeByKey[key];
           node.__data__ = nodeData;
           updateNodes[i] = node;
           enterNodes[i] = exitNodes[i] = null;
@@ -1731,7 +1732,7 @@ d3_selectionPrototype.data = function(data, join) {
       }
 
       for (i = -1; ++i < n;) {
-        if (keys[i] in nodeByKey) {
+        if (nodeByKey.hasOwnProperty(keys[i])) {
           exitNodes[i] = group[i];
         }
       }
diff --git a/d3.v2.min.js b/d3.v2.min.js
index 04bcdb9d..7f053740 100644
--- a/d3.v2.min.js
+++ b/d3.v2.min.js
@@ -1,4 +1,4 @@
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c=b.parse(a);return c&&c._}finally{fR=Date}},c.toString=b.toString,c},gE.prototype={getDate:function(){return this._.getUTCDate()},getDay:function(){return this._.getUTCDay()},getFullYear:function(){return this._.getUTCFullYear()},getHours:function(){return this._.getUTCHours()},getMilliseconds:function(){return this._.getUTCMilliseconds()},getMinutes:function(){return this._.getUTCMinutes()},getMonth:function(){return this._.getUTCMonth()},getSeconds:function(){return this._.getUTCSeconds()},getTimezoneOffset:function(){return 0},valueOf:function(){return this._.getTime()},setDate:function(a){this._.setUTCDate(a)},setDay:function(a){this._.setUTCDay(a)},setFullYear:function(a){this._.setUTCFullYear(a)},setHours:function(a){this._.setUTCHours(a)},setMilliseconds:function(a){this._.setUTCMilliseconds(a)},setMinutes:function(a){this._.setUTCMinutes(a)},setMonth:function(a){this._.setUTCMonth(a)},setSeconds:function(a){this._.setUTCSeconds(a)}};var gF=d3.time.format.utc("%Y-%m-%dT%H:%M:%S.%LZ");d3.time.format.iso=Date.prototype.toISOString?gG:gF,gG.parse=function(a){return new Date(a)},gG.toString=gF.toString,d3.time.second=function(a){return new Date(~~(a/1e3)*1e3)},d3.time.second.utc=d3.time.second,d3.time.seconds=gH(d3.time.second,function(a){a.setTime(a.getTime()+1e3)},function(a){return a.getSeconds()}),d3.time.seconds.utc=d3.time.seconds,d3.time.minute=function(a){return new Date(~~(a/6e4)*6e4)},d3.time.minute.utc=d3.time.minute,d3.time.minutes=gH(d3.time.minute,gI,function(a){return a.getMinutes()}),d3.time.minutes.utc=gH(d3.time.minute,gI,function(a){return a.getUTCMinutes()}),d3.time.hour=function(a){var b=a.getTimezoneOffset()/60;return new Date((~~(a/36e5-b)+b)*36e5)},d3.time.hour.utc=function(a){return new Date(~~(a/36e5)*36e5)},d3.time.hours=gH(d3.time.hour,gJ,function(a){return a.getHours()}),d3.time.hours.utc=gH(d3.time.hour.utc,gJ,function(a){return a.getUTCHours()}),d3.time.day=function(a){return new Date(a.getFullYear(),a.getMonth(),a.getDate())},d3.time.day.utc=function(a){return new Date(~~(a/864e5)*864e5)},d3.time.days=gH(d3.time.day,function(a){a.setDate(a.getDate()+1)},function(a){return a.getDate()-1}),d3.time.days.utc=gH(d3.time.day.utc,function(a){a.setUTCDate(a.getUTCDate()+1)},function(a){return a.getUTCDate()-1}),d3.time.week=function(a){return(a=d3.time.day(a)).setDate(a.getDate()-a.getDay()),a},d3.time.week.utc=function(a){return(a=d3.time.day.utc(a)).setUTCDate(a.getUTCDate()-a.getUTCDay()),a},d3.time.weeks=gH(d3.time.week,function(a){a.setDate(a.getDate()+7)},function(a){return~~((a-new Date(a.getFullYear(),0,1))/6048e5)}),d3.time.weeks.utc=gH(d3.time.week.utc,function(a){a.setUTCDate(a.getUTCDate()+7)},function(a){return~~((a-Date.UTC(a.getUTCFullYear(),0,1))/6048e5)}),d3.time.month=function(a){return new Date(a.getFullYear(),a.getMonth(),1)},d3.time.month.utc=function(a){return new Date(Date.UTC(a.getUTCFullYear(),a.getUTCMonth(),1))},d3.time.months=gH(d3.time.month,function(a){a.setMonth(a.getMonth()+1)},function(a){return a.getMonth()}),d3.time.months.utc=gH(d3.time.month.utc,function(a){a.setUTCMonth(a.getUTCMonth()+1)},function(a){return a.getUTCMonth()}),d3.time.year=function(a){return new Date(a.getFullYear(),0,1)},d3.time.year.utc=function(a){return new Date(Date.UTC(a.getUTCFullYear(),0,1))},d3.time.years=gH(d3.time.year,function(a){a.setFullYear(a.getFullYear()+1)},function(a){return a.getFullYear()}),d3.time.years.utc=gH(d3.time.year.utc,function(a){a.setUTCFullYear(a.getUTCFullYear()+1)},function(a){return a.getUTCFullYear()});var gQ=[1e3,5e3,15e3,3e4,6e4,3e5,9e5,18e5,36e5,108e5,216e5,432e5,864e5,1728e5,6048e5,2592e6,7776e6,31536e6],gR=[[d3.time.seconds,1],[d3.time.seconds,5],[d3.time.seconds,15],[d3.time.seconds,30],[d3.time.minutes,1],[d3.time.minutes,5],[d3.time.minutes,15],[d3.time.minutes,30],[d3.time.hours,1],[d3.time.hours,3],[d3.time.hours,6],[d3.time.hours,12],[d3.time.days,1],[d3.time.days,2],[d3.time.weeks,1],[d3.time.months,1],[d3.time.months,3],[d3.time.years,1]],gS=[[d3.time.format("%Y"),function(a){return!0}],[d3.time.format("%B"),function(a){return a.getMonth()}],[d3.time.format("%b %d"),function(a){return a.getDate()!=1}],[d3.time.format("%a %d"),function(a){return a.getDay()&&a.getDate()!=1}],[d3.time.format("%I %p"),function(a){return a.getHours()}],[d3.time.format("%I:%M"),function(a){return a.getMinutes()}],[d3.time.format(":%S"),function(a){return a.getSeconds()}],[d3.time.format(".%L"),function(a){return a.getMilliseconds()}]],gT=d3.scale.linear(),gU=gN(gS);gR.year=function(a,b){return gT.domain(a.map(gP)).ticks(b).map(gO)},d3.time.scale=function(){return gK(d3.scale.linear(),gR,gU)};var gV=[[d3.time.seconds.utc,1],[d3.time.seconds.utc,5],[d3.time.seconds.utc,15],[d3.time.seconds.utc,30],[d3.time.minutes.utc,1],[d3.time.minutes.utc,5],[d3.time.minutes.utc,15],[d3.time.minutes.utc,30],[d3.time.hours.utc,1],[d3.time.hours.utc,3],[d3.time.hours.utc,6],[d3.time.hours.utc,12],[d3.time.days.utc,1],[d3.time.days.utc,2],[d3.time.weeks.utc,1],[d3.time.months.utc,1],[d3.time.months.utc,3],[d3.time.years.utc,1]],gW=[[d3.time.format.utc("%Y"),function(a){return!0}],[d3.time.format.utc("%B"),function(a){return a.getUTCMonth()}],[d3.time.format.utc("%b %d"),function(a){return a.getUTCDate()!=1}],[d3.time.format.utc("%a %d"),function(a){return a.getUTCDay()&&a.getUTCDate()!=1}],[d3.time.format.utc("%I %p"),function(a){return a.getUTCHours()}],[d3.time.format.utc("%I:%M"),function(a){return a.getUTCMinutes()}],[d3.time.format.utc(":%S"),function(a){return a.getUTCSeconds()}],[d3.time.format.utc(".%L"),function(a){return a.getUTCMilliseconds()}]],gX=gN(gW);gV.year=function(a,b){return gT.domain(a.map(gZ)).ticks(b).map(gY)},d3.time.scale.utc=function(){return gK(d3.scale.linear(),gV,gX)}})();
\ No newline at end of file
diff --git a/src/core/selection-data.js b/src/core/selection-data.js
index a54d4e14..b2986bc0 100644
--- a/src/core/selection-data.js
+++ b/src/core/selection-data.js
@@ -24,7 +24,7 @@ d3_selectionPrototype.data = function(data, join) {
 
       for (i = -1; ++i < n;) {
         key = join.call(node = group[i], node.__data__, i);
-        if (key in nodeByKey) {
+        if (nodeByKey.hasOwnProperty(key)) {
           exitNodes[j++] = node; // duplicate key
         } else {
           nodeByKey[key] = node;
@@ -33,8 +33,9 @@ d3_selectionPrototype.data = function(data, join) {
       }
 
       for (i = -1; ++i < m;) {
-        node = nodeByKey[key = join.call(groupData, nodeData = groupData[i], i)];
-        if (node) {
+        key = join.call(groupData, nodeData = groupData[i], i)
+        if (nodeByKey.hasOwnProperty(key)) {
+          node = nodeByKey[key];
           node.__data__ = nodeData;
           updateNodes[i] = node;
           enterNodes[i] = exitNodes[i] = null;
@@ -46,7 +47,7 @@ d3_selectionPrototype.data = function(data, join) {
       }
 
       for (i = -1; ++i < n;) {
-        if (keys[i] in nodeByKey) {
+        if (nodeByKey.hasOwnProperty(keys[i])) {
           exitNodes[i] = group[i];
         }
       }
diff --git a/test/core/selection-data-test.js b/test/core/selection-data-test.js
index c0732f80..3a682218 100644
--- a/test/core/selection-data-test.js
+++ b/test/core/selection-data-test.js
@@ -160,6 +160,15 @@ suite.addBatch({
       assert.domNull(exit[0][1]);
       assert.domEqual(exit[1][0], span[1][0]);
       assert.domNull(exit[1][1]);
+    },
+    "handles keys that are in the default object's prototype chain": function(span) {
+      // This also applies to the non-standard "watch" and "unwatch" in Mozilla Firefox.
+      var update = span.data(["hasOwnProperty", "isPrototypeOf", "toLocaleString", "toString", "valueOf"], String);
+      assert.domNull(update[0][0]);
+      assert.domNull(update[0][1]);
+      assert.domNull(update[0][2]);
+      assert.domNull(update[0][3]);
+      assert.domNull(update[0][4]);
     }
   }
 });