merging with #1632 and making can.proxy work faster

util/can.js

@@ -40,7 +40,19 @@ steal(function () {
 	can.last = function(arr){
 		return arr && arr[arr.length - 1];
 	};
-
+	var protoBind = Function.prototype.bind;
+	if(protoBind) {
+		can.proxy = function(fn, context){
+			return protoBind.apply(fn, context);
+		};
+	} else {
+		can.proxy = function (fn, context) {
+			return function () {
+				return fn.apply(context, arguments);
+			};
+		};
+	}
+
 
 	can.frag = function(item){
 		var frag;

util/jquery/jquery.js

@@ -95,11 +95,7 @@ steal('jquery', 'can/util/can.js', 'can/util/attr', "can/event", 'can/util/array
 			}
 			return this;
 		},
-		proxy: function (fn, context) {
-			return function () {
-				return fn.apply(context, arguments);
-			};
-		},
+		proxy: can.proxy,
 		attr: attr
 	});
 	// Wrap binding functions.

util/mootools/mootools.js

@@ -103,13 +103,6 @@ steal('can/util/can.js', 'can/util/attr', 'mootools', 'can/event', 'can/util/fra
 			return Object.keys(object)
 				.length === 0;
 		};
-		var k = function(){};
-		// Map function helpers.
-		can.proxy = function () {
-			var args = can.makeArray(arguments),
-				func = args.shift();
-			return k.bind.apply(func, args);
-		};
 		can.isFunction = function (f) {
 			return typeOf(f) === 'function';
 		};

util/zepto/zepto.js

@@ -180,12 +180,6 @@ steal('can/util/can.js', 'can/util/attr', 'can/event', 'zepto', 'can/util/object
 			return ret;
 		};
 
-		can.proxy = function (f, ctx) {
-			return function () {
-				return f.apply(ctx, arguments);
-			};
-		};
-
 		// Make ajax.
 		var XHR = $.ajaxSettings.xhr;
 		$.ajaxSettings.xhr = function () {

view/stache/doc/helpers/data.md

@@ -1,6 +1,6 @@
 @function can.stache.helpers.data {{data name}}
 @parent can.stache.htags 7
-@signature `{{data name}}`
+@signature `{{data name[ key]}}`
 
 Adds the current [can.stache.context context] to the
 element's [can.data].
@@ -12,23 +12,15 @@ context.
 
 ## Use
 
-It is common for you to want some data in the template to be available
+It is common to want some data in the template to be available
 on an element.  `{{data name}}` allows you to save the
 context so it can later be retrieved by [can.data] or
-`$.fn.data`. For example,
+`$.fn.data`. 
 
-The template:
+<a class="jsbin-embed" href="http://jsbin.com/juxem/7/embed?html,js,output">JS Bin</a><script src="http://static.jsbin.com/js/embed.js"></script>
 
-    <ul>
-      <li id="person" {{data 'person'}}>{{name}}</li>
-    </ul>
+### Getting more specific
 
-Rendered with:
-
-    document.body.appendChild(
-      can.stache(template,{ person: { name: 'Austin' } });
-
-Retrieve the person data back with:
-
-    $("#person").data("person")
+By passing a key name as the second argument to the data helper, you can specify which data is used: `{{data name key}}`.
 
+<a class="jsbin-embed" href="http://jsbin.com/munuco/1/embed?html,js,output">JS Bin</a><script src="http://static.jsbin.com/js/embed.js"></script>