Merge branch 'master' of git://github.com/jquery/jquery into bug_7931

14 files changed, 609 insertions, 381 deletions

diff --git a/src/ajax.js b/src/ajax.js
index d570fcccb..871481d01 100644
--- a/src/ajax.js
+++ b/src/ajax.js
@@ -61,26 +61,34 @@ jQuery.fn.extend({
 			type: type,
 			dataType: "html",
 			data: params,
-			complete: function( res, status ) {
+			// Complete callback (responseText is used internally)
+			complete: function( jXHR, status, responseText ) {
+				// Store the response as specified by the jXHR object
+				responseText = jXHR.responseText;
 				// If successful, inject the HTML into all the matched elements
-				if ( status === "success" || status === "notmodified" ) {
+				if ( jXHR.isResolved() ) {
+					// #4825: Get the actual response in case
+					// a dataFilter is present in ajaxSettings
+					jXHR.done(function( r ) {
+						responseText = r;
+					});
 					// See if a selector was specified
 					self.html( selector ?
 						// Create a dummy div to hold the results
 						jQuery("<div>")
 							// inject the contents of the document in, removing the scripts
 							// to avoid any 'Permission Denied' errors in IE
-							.append(res.responseText.replace(rscript, ""))
+							.append(responseText.replace(rscript, ""))
 
 							// Locate the specified elements
 							.find(selector) :
 
 						// If not, just inject the full result
-						res.responseText );
+						responseText );
 				}
 
 				if ( callback ) {
-					self.each( callback, [res.responseText, status, res] );
+					self.each( callback, [responseText, status, jXHR] );
 				}
 			}
 		});
@@ -152,7 +160,8 @@ jQuery.extend({
 	},
 
 	ajaxSetup: function( settings ) {
-		jQuery.extend( jQuery.ajaxSettings, settings );
+		jQuery.extend( true, jQuery.ajaxSettings, settings );
+		return this;
 	},
 
 	ajaxSettings: {
@@ -166,11 +175,12 @@ jQuery.extend({
 		timeout: 0,
 		data: null,
 		dataType: null,
-		dataTypes: null,
 		username: null,
 		password: null,
 		cache: null,
 		traditional: false,
+		headers: {},
+		crossDomain: null,
 		*/
 		xhr: function() {
 			return new window.XMLHttpRequest();
@@ -257,6 +267,8 @@ jQuery.extend({
 			// Deferreds
 			deferred = jQuery.Deferred(),
 			completeDeferred = jQuery._Deferred(),
+			// Status-dependent callbacks
+			statusCode = s.statusCode || {},
 			// Headers (they are sent all at once)
 			requestHeaders = {},
 			// Response headers
@@ -266,6 +278,9 @@ jQuery.extend({
 			transport,
 			// timeout handle
 			timeoutTimer,
+			// Cross-domain detection vars
+			loc = document.location,
+			parts,
 			// The jXHR state
 			state = 0,
 			// Loop variable
@@ -292,30 +307,35 @@ jQuery.extend({
 				// (match is used internally)
 				getResponseHeader: function( key , match ) {
 
-					if ( state !== 2 ) {
-						return null;
-					}
+					if ( state === 2 ) {
 
-					if ( responseHeaders === undefined ) {
+						if ( responseHeaders === undefined ) {
 
-						responseHeaders = {};
+							responseHeaders = {};
 
-						if ( typeof responseHeadersString === "string" ) {
+							if ( typeof responseHeadersString === "string" ) {
 
-							while( ( match = rheaders.exec( responseHeadersString ) ) ) {
-								responseHeaders[ match[ 1 ].toLowerCase() ] = match[ 2 ];
+								while( ( match = rheaders.exec( responseHeadersString ) ) ) {
+									responseHeaders[ match[ 1 ].toLowerCase() ] = match[ 2 ];
+								}
 							}
 						}
+						match = responseHeaders[ key.toLowerCase() ];
+
+					} else {
+
+						match = null;
 					}
-					return responseHeaders[ key.toLowerCase() ];
+
+					return match;
 				},
 
 				// Cancel the request
 				abort: function( statusText ) {
-					if ( transport && state !== 2 ) {
+					if ( transport ) {
 						transport.abort( statusText || "abort" );
-						done( 0 , statusText );
 					}
+					done( 0 , statusText );
 					return this;
 				}
 			};
@@ -333,6 +353,10 @@ jQuery.extend({
 			// State is "done" now
 			state = 2;
 
+			// Dereference transport for early garbage collection
+			// (no matter how long the jXHR transport will be used
+			transport = 0;
+
 			// Set readyState
 			jXHR.readyState = status ? 4 : 0;
 
@@ -354,17 +378,10 @@ jQuery.extend({
 				// Stored success
 				success,
 				// Stored error
-				error = statusText;
-
-			// If not timeout, force a jQuery-compliant status text
-			if ( statusText != "timeout" ) {
-				statusText = ( status >= 200 && status < 300 ) ?
-					"success" :
-					( status === 304 ? "notmodified" : "error" );
-			}
+				error;
 
 			// If successful, handle type chaining
-			if ( statusText === "success" || statusText === "notmodified" ) {
+			if ( status >= 200 && status < 300 || status === 304 ) {
 
 				// Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
 				if ( s.ifModified ) {
@@ -380,91 +397,124 @@ jQuery.extend({
 					}
 				}
 
-				if ( s.ifModified && statusText === "notmodified" ) {
+				// If not modified
+				if ( status === 304 ) {
 
-					success = null;
+					// Set the statusText accordingly
+					statusText = "notmodified";
+					// Mark as a success
 					isSuccess = 1;
 
+				// If we have data
 				} else {
+
+					// Set the statusText accordingly
+					statusText = "success";
+
 					// Chain data conversions and determine the final value
 					// (if an exception is thrown in the process, it'll be notified as an error)
 					try {
 
 						var i,
+							// Current dataType
 							current,
+							// Previous dataType
 							prev,
-							checker,
+							// Conversion function
 							conv,
+							// Conversion functions (when text is used in-between)
 							conv1,
 							conv2,
-							convertion,
+							// Local references to dataTypes & converters
 							dataTypes = s.dataTypes,
 							converters = s.converters,
+							// DataType to responseXXX field mapping
 							responses = {
 								"xml": "XML",
 								"text": "Text"
 							};
 
+						// For each dataType in the chain
 						for( i = 0 ; i < dataTypes.length ; i++ ) {
 
 							current = dataTypes[ i ];
 
+							// If a responseXXX field for this dataType exists
+							// and if it hasn't been set yet
 							if ( responses[ current ] ) {
+								// Set it
 								jXHR[ "response" + responses[ current ] ] = response;
+								// Mark it as set
 								responses[ current ] = 0;
 							}
 
+							// If this is not the first element
 							if ( i ) {
 
+								// Get the dataType to convert from
 								prev = dataTypes[ i - 1 ];
 
+								// If no catch-all and dataTypes are actually different
 								if ( prev !== "*" && current !== "*" && prev !== current ) {
 
-									conv = converters[ ( conversion = prev + " " + current ) ] ||
+									// Get the converter
+									conv = converters[ prev + " " + current ] ||
 										converters[ "* " + current ];
 
 									conv1 = conv2 = 0;
 
+									// If there is no direct converter and none of the dataTypes is text
 									if ( ! conv && prev !== "text" && current !== "text" ) {
+										// Try with text in-between
 										conv1 = converters[ prev + " text" ] || converters[ "* text" ];
 										conv2 = converters[ "text " + current ];
+										// Revert back to a single converter
+										// if one of the converter is an equivalence
 										if ( conv1 === true ) {
 											conv = conv2;
 										} else if ( conv2 === true ) {
 											conv = conv1;
 										}
 									}
-
+									// If we found no converter, dispatch an error
 									if ( ! ( conv || conv1 && conv2 ) ) {
 										throw conversion;
 									}
-
+									// If found converter is not an equivalence
 									if ( conv !== true ) {
+										// Convert with 1 or 2 converters accordingly
 										response = conv ? conv( response ) : conv2( conv1( response ) );
 									}
 								}
+							// If it is the first element of the chain
+							// and we have a dataFilter
 							} else if ( s.dataFilter ) {
-
-								response = s.dataFilter( response );
+								// Apply the dataFilter
+								response = s.dataFilter( response , current );
+								// Get dataTypes again in case the filter changed them
 								dataTypes = s.dataTypes;
 							}
 						}
+						// End of loop
 
 						// We have a real success
 						success = response;
 						isSuccess = 1;
 
+					// If an exception was thrown
 					} catch(e) {
 
+						// We have a parsererror
 						statusText = "parsererror";
 						error = "" + e;
 
 					}
 				}
 
-			} else { // if not success, mark it as an error
+			// if not success, mark it as an error
+			} else {
 
-					error = error || statusText;
+					error = statusText = statusText || "error";
 
 					// Set responseText if needed
 					if ( response ) {
@@ -483,6 +533,9 @@ jQuery.extend({
 				deferred.fireReject( callbackContext , [ jXHR , statusText , error ] );
 			}
 
+			// Status-dependent callbacks
+			jXHR.statusCode( statusCode );
+
 			if ( s.global ) {
 				globalEventContext.trigger( "ajax" + ( isSuccess ? "Success" : "Error" ) ,
 						[ jXHR , s , isSuccess ? success : error ] );
@@ -506,23 +559,37 @@ jQuery.extend({
 		jXHR.error = jXHR.fail;
 		jXHR.complete = completeDeferred.done;
 
+		// Status-dependent callbacks
+		jXHR.statusCode = function( map ) {
+			if ( map ) {
+				var resolved = jXHR.isResolved(),
+					tmp;
+				if ( resolved || jXHR.isRejected() ) {
+					tmp = map[ jXHR.status ];
+					if ( tmp ) {
+						if ( map === statusCode ) {
+							delete statusCode[ jXHR.status ];
+						}
+						jXHR[ resolved ? "done" : "fail" ]( tmp );
+					}
+				} else {
+					for( tmp in map ) {
+						statusCode[ tmp ] = [ statusCode[ tmp ] , map[ tmp ] ];
+					}
+				}
+			}
+			return this;
+		};
+
 		// Remove hash character (#7531: and string promotion)
 		s.url = ( "" + s.url ).replace( rhash , "" );
 
-		// Uppercase the type
-		s.type = s.type.toUpperCase();
-
-		// Determine if request has content
-		s.hasContent = ! rnoContent.test( s.type );
-
 		// Extract dataTypes list
 		s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( /\s+/ );
 
 		// Determine if a cross-domain request is in order
-		var parts = rurl.exec( s.url.toLowerCase() ),
-			loc = location;
-
 		if ( ! s.crossDomain ) {
+			parts = rurl.exec( s.url.toLowerCase() );
 			s.crossDomain = !!(
 					parts &&
 					( parts[ 1 ] && parts[ 1 ] != loc.protocol ||
@@ -532,88 +599,97 @@ jQuery.extend({
 		}
 
 		// Convert data if not already a string
-		if ( s.data && s.processData && typeof s.data != "string" ) {
+		if ( s.data && s.processData && typeof s.data !== "string" ) {
 			s.data = jQuery.param( s.data , s.traditional );
 		}
 
-		// Get transport
-		transport = jQuery.ajax.prefilter( s , options ).transport( s );
+		// Apply prefilters
+		jQuery.ajaxPrefilter( s , options );
+
+		// Uppercase the type
+		s.type = s.type.toUpperCase();
+
+		// Determine if request has content
+		s.hasContent = ! rnoContent.test( s.type );
 
 		// Watch for a new set of requests
 		if ( s.global && jQuery.active++ === 0 ) {
 			jQuery.event.trigger( "ajaxStart" );
 		}
 
-		// If no transport, we auto-abort
-		if ( ! transport ) {
+		// More options handling for requests with no content
+		if ( ! s.hasContent ) {
 
-			done( 0 , "transport not found" );
-			jXHR = false;
-
-		} else {
+			// If data is available, append data to url
+			if ( s.data ) {
+				s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.data;
+			}
 
-			// More options handling for requests with no content
-			if ( ! s.hasContent ) {
+			// Add anti-cache in url if needed
+			if ( s.cache === false ) {
 
-				// If data is available, append data to url
-				if ( s.data ) {
-					s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.data;
-				}
+				var ts = jQuery.now(),
+					// try replacing _= if it is there
+					ret = s.url.replace( rts , "$1_=" + ts );
 
-				// Add anti-cache in url if needed
-				if ( s.cache === false ) {
+				// if nothing was replaced, add timestamp to the end
+				s.url = ret + ( (ret == s.url ) ? ( rquery.test( s.url ) ? "&" : "?" ) + "_=" + ts : "");
+			}
+		}
 
-					var ts = jQuery.now(),
-						// try replacing _= if it is there
-						ret = s.url.replace( rts , "$1_=" + ts );
+		// Set the correct header, if data is being sent
+		if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
+			requestHeaders[ "content-type" ] = s.contentType;
+		}
 
-					// if nothing was replaced, add timestamp to the end
-					s.url = ret + ( (ret == s.url ) ? ( rquery.test( s.url ) ? "&" : "?" ) + "_=" + ts : "");
-				}
+		// Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
+		if ( s.ifModified ) {
+			if ( jQuery_lastModified[ s.url ] ) {
+				requestHeaders[ "if-modified-since" ] = jQuery_lastModified[ s.url ];
 			}
-
-			// Set the correct header, if data is being sent
-			if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
-				requestHeaders[ "content-type" ] = s.contentType;
+			if ( jQuery_etag[ s.url ] ) {
+				requestHeaders[ "if-none-match" ] = jQuery_etag[ s.url ];
 			}
+		}
 
-			// Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
-			if ( s.ifModified ) {
-				if ( jQuery_lastModified[ s.url ] ) {
-					requestHeaders[ "if-modified-since" ] = jQuery_lastModified[ s.url ];
-				}
-				if ( jQuery_etag[ s.url ] ) {
-					requestHeaders[ "if-none-match" ] = jQuery_etag[ s.url ];
-				}
-			}
+		// Set the Accepts header for the server, depending on the dataType
+		requestHeaders.accept = s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[ 0 ] ] ?
+			s.accepts[ s.dataTypes[ 0 ] ] + ( s.dataTypes[ 0 ] !== "*" ? ", */*; q=0.01" : "" ) :
+			s.accepts[ "*" ];
+
+		// Check for headers option
+		for ( i in s.headers ) {
+			requestHeaders[ i.toLowerCase() ] = s.headers[ i ];
+		}
 
-			// Set the Accepts header for the server, depending on the dataType
-			requestHeaders.accept = s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[ 0 ] ] ?
-				s.accepts[ s.dataTypes[ 0 ] ] + ( s.dataTypes[ 0 ] !== "*" ? ", */*; q=0.01" : "" ) :
-				s.accepts[ "*" ];
+		// Allow custom headers/mimetypes and early abort
+		if ( s.beforeSend && ( s.beforeSend.call( callbackContext , jXHR , s ) === false || state === 2 ) ) {
 
-			// Check for headers option
-			for ( i in s.headers ) {
-				requestHeaders[ i.toLowerCase() ] = s.headers[ i ];
+				// Abort if not done already
+				done( 0 , "abort" );
+
+				// Return false
+				jXHR = false;
+
+		} else {
+
+			// Install callbacks on deferreds
+			for ( i in { success:1, error:1, complete:1 } ) {
+				jXHR[ i ]( s[ i ] );
 			}
 
-			// Allow custom headers/mimetypes and early abort
-			if ( s.beforeSend && ( s.beforeSend.call( callbackContext , jXHR , s ) === false || state === 2 ) ) {
+			// Get transport
+			transport = jQuery.ajaxTransport( s );
 
-					// Abort if not done already
-					done( 0 , "abort" );
-					jXHR = false;
+			// If no transport, we auto-abort
+			if ( ! transport ) {
+
+				done( 0 , "notransport" );
 
 			} else {
 
 				// Set state as sending
-				state = 1;
-				jXHR.readyState = 1;
-
-				// Install callbacks on deferreds
-				for ( i in { success:1, error:1, complete:1 } ) {
-					jXHR[ i ]( s[ i ] );
-				}
+				state = jXHR.readyState = 1;
 
 				// Send global event
 				if ( s.global ) {
@@ -787,7 +863,7 @@ function ajax_selectOrExecute( structure , s ) {
 		}
 	}
 
-	return noSelect ? jQuery.ajax : selected;
+	return noSelect ? jQuery : selected;
 }
 
 // Add an element to one of the structures in ajaxSettings
@@ -846,13 +922,13 @@ function ajax_addElement( structure , args ) {
 		}
 	}
 
-	return jQuery.ajax;
+	return jQuery;
 }
 
 // Install prefilter & transport methods
-jQuery.each( [ "prefilter" , "transport" ] , function( _ , name ) {
-	_ = name + "s";
-	jQuery.ajax[ name ] = function() {
+jQuery.each( [ "Prefilter" , "Transport" ] , function( _ , name ) {
+	_ = name.toLowerCase() + "s";
+	jQuery[ "ajax" + name ] = function() {
 		return ajax_addElement( _ , arguments );
 	};
 } );
diff --git a/src/ajax/jsonp.js b/src/ajax/jsonp.js
index f4b324e17..883876fc0 100644
--- a/src/ajax/jsonp.js
+++ b/src/ajax/jsonp.js
@@ -1,8 +1,7 @@
 (function( jQuery ) {
 
 var jsc = jQuery.now(),
-	jsre = /\=(?:\?|%3F)(&|$)/i,
-	rquery_jsonp = /\?/;
+	jsre = /(\=)(?:\?|%3F)(&|$)|()(?:\?\?|%3F%3F)()/i;
 
 // Default jsonp settings
 jQuery.ajaxSetup({
@@ -10,75 +9,78 @@ jQuery.ajaxSetup({
 	jsonpCallback: function() {
 		return "jsonp" + jsc++;
 	}
-});
 
-// Normalize jsonp queries
-// 1) put callback parameter in url or data
-// 2) sneakily ensure transportDataType is always jsonp for jsonp requests
-jQuery.ajax.prefilter("json jsonp", function(s, originalSettings) {
+// Detect, normalize options and install callbacks for jsonp requests
+// (dataIsString is used internally)
+}).ajaxPrefilter("json jsonp", function(s, originalSettings, dataIsString) {
+
+	dataIsString = ( typeof(s.data) === "string" );
 
 	if ( s.dataTypes[ 0 ] === "jsonp" ||
-		originalSettings.jsonp ||
 		originalSettings.jsonpCallback ||
-		jsre.test(s.url) ||
-		typeof(s.data) === "string" && jsre.test(s.data) ) {
+		originalSettings.jsonp != null ||
+		s.jsonp !== false && ( jsre.test( s.url ) ||
+				dataIsString && jsre.test( s.data ) ) ) {
 
-		var jsonpCallback = s.jsonpCallback =
+		var responseContainer,
+			jsonpCallback = s.jsonpCallback =
 				jQuery.isFunction( s.jsonpCallback ) ? s.jsonpCallback() : s.jsonpCallback,
-			url = s.url.replace(jsre, "=" + jsonpCallback + "$1"),
-			data = s.url === url && typeof(s.data) === "string" ? s.data.replace(jsre, "=" + jsonpCallback + "$1") : s.data;
-
-		if ( url === s.url && data === s.data ) {
-			url += (rquery_jsonp.test( url ) ? "&" : "?") + s.jsonp + "=" + jsonpCallback;
+			previous = window[ jsonpCallback ],
+			url = s.url,
+			data = s.data,
+			replace = "$1" + jsonpCallback + "$2";
+
+		if ( s.jsonp !== false ) {
+			url = url.replace( jsre, replace );
+			if ( s.url === url ) {
+				if ( dataIsString ) {
+					data = data.replace( jsre, replace );
+				}
+				if ( s.data === data ) {
+					// Add callback manually
+					url += (/\?/.test( url ) ? "&" : "?") + s.jsonp + "=" + jsonpCallback;
+				}
+			}
 		}
 
 		s.url = url;
 		s.data = data;
-		s.dataTypes[ 0 ] = "jsonp";
-	}
-
-// Bind transport to jsonp dataType
-}).transport("jsonp", function(s) {
 
-	// Put callback in place
-	var responseContainer,
-		jsonpCallback = s.jsonpCallback,
-		previous = window[ jsonpCallback ];
+		window [ jsonpCallback ] = function( response ) {
+			responseContainer = [response];
+		};
 
-	window [ jsonpCallback ] = function( response ) {
-		responseContainer = [response];
-	};
+		s.complete = [function() {
 
-	s.complete = [function() {
+			// Set callback back to previous value
+			window[ jsonpCallback ] = previous;
 
-		// Set callback back to previous value
-		window[ jsonpCallback ] = previous;
-
-		// Call if it was a function and we have a response
-		if ( previous) {
-			if ( responseContainer && jQuery.isFunction ( previous ) ) {
-				window[ jsonpCallback ] ( responseContainer[0] );
+			// Call if it was a function and we have a response
+			if ( previous) {
+				if ( responseContainer && jQuery.isFunction ( previous ) ) {
+					window[ jsonpCallback ] ( responseContainer[0] );
+				}
+			} else {
+				// else, more memory leak avoidance
+				try{ delete window[ jsonpCallback ]; } catch(e){}
 			}
-		} else {
-			// else, more memory leak avoidance
-			try{ delete window[ jsonpCallback ]; } catch(e){}
-		}
 
-	}, s.complete ];
+		}, s.complete ];
 
-	// Sneakily ensure this will be handled as json
-	s.dataTypes[ 0 ] = "json";
+		// Use data converter to retrieve json after script execution
+		s.converters["script json"] = function() {
+			if ( ! responseContainer ) {
+				jQuery.error( jsonpCallback + " was not called" );
+			}
+			return responseContainer[ 0 ];
+		};
 
-	// Use data converter to retrieve json after script execution
-	s.converters["script json"] = function() {
-		if ( ! responseContainer ) {
-			jQuery.error( jsonpCallback + " was not called" );
-		}
-		return responseContainer[ 0 ];
-	};
+		// force json dataType
+		s.dataTypes[ 0 ] = "json";
 
-	// Delegate to script transport
-	return "script";
+		// Delegate to script
+		return "script";
+	}
 });
 
 })( jQuery );
diff --git a/src/ajax/script.js b/src/ajax/script.js
index 0db0de6c7..b0e576f27 100644
--- a/src/ajax/script.js
+++ b/src/ajax/script.js
@@ -1,7 +1,7 @@
 (function( jQuery ) {
 
-// Install text to script executor
-jQuery.extend( true, jQuery.ajaxSettings , {
+// Install script dataType
+jQuery.ajaxSetup({
 
 	accepts: {
 		script: "text/javascript, application/javascript"
@@ -14,20 +14,24 @@ jQuery.extend( true, jQuery.ajaxSettings , {
 	converters: {
 		"text script": jQuery.globalEval
 	}
-} );
 
-// Bind script tag hack transport
-jQuery.ajax.transport("script", function(s) {
+// Handle cache's special case and global
+}).ajaxPrefilter("script", function(s) {
 
-	// Handle cache special case
 	if ( s.cache === undefined ) {
 		s.cache = false;
 	}
 
-	// This transport only deals with cross domain get requests
-	if ( s.crossDomain && s.async && ( s.type === "GET" || ! s.data ) ) {
-
+	if ( s.crossDomain ) {
+		s.type = "GET";
 		s.global = false;
+	}
+
+// Bind script tag hack transport
+}).ajaxTransport("script", function(s) {
+
+	// This transport only deals with cross domain requests
+	if ( s.crossDomain ) {
 
 		var script,
 			head = document.getElementsByTagName("head")[0] || document.documentElement;
@@ -47,7 +51,7 @@ jQuery.ajax.transport("script", function(s) {
 				script.src = s.url;
 
 				// Attach handlers for all browsers
-				script.onload = script.onreadystatechange = function( _ , statusText) {
+				script.onload = script.onreadystatechange = function( _ , isAbort ) {
 
 					if ( ! script.readyState || /loaded|complete/.test( script.readyState ) ) {
 
@@ -59,10 +63,13 @@ jQuery.ajax.transport("script", function(s) {
 							head.removeChild( script );
 						}
 
+						// Dereference the script
 						script = 0;
 
-						// Callback
-						callback( statusText ? 0 : 200, statusText || "success" );
+						// Callback if not abort
+						if ( ! isAbort ) {
+							callback( 200, "success" );
+						}
 					}
 				};
 				// Use insertBefore instead of appendChild  to circumvent an IE6 bug.
@@ -70,9 +77,9 @@ jQuery.ajax.transport("script", function(s) {
 				head.insertBefore( script, head.firstChild );
 			},
 
-			abort: function(statusText) {
+			abort: function() {
 				if ( script ) {
-					script.onload( 0 , statusText );
+					script.onload(0,1);
 				}
 			}
 		};
diff --git a/src/ajax/xhr.js b/src/ajax/xhr.js
index 26e91ce79..34aa832fe 100644
--- a/src/ajax/xhr.js
+++ b/src/ajax/xhr.js
@@ -1,19 +1,16 @@
 (function( jQuery ) {
 
-var // Next fake timer id
-	xhrPollingId = jQuery.now(),
+var // Next active xhr id
+	xhrId = jQuery.now(),
 
-	// Callbacks hashtable
+	// active xhrs
 	xhrs = {},
 
-	// XHR pool
-	xhrPool = [],
+	// #5280: see below
+	xhrUnloadAbortInstalled;
 
-	// #5280: see end of file
-	xhrUnloadAbortMarker;
 
-
-jQuery.ajax.transport( function( s , determineDataType ) {
+jQuery.ajaxTransport( function( s , determineDataType ) {
 
 	// Cross domain only allowed if supported through XMLHttpRequest
 	if ( ! s.crossDomain || jQuery.support.cors ) {
@@ -25,26 +22,24 @@ jQuery.ajax.transport( function( s , determineDataType ) {
 			send: function(headers, complete) {
 
 				// #5280: we need to abort on unload or IE will keep connections alive
-				if ( ! xhrUnloadAbortMarker ) {
+				if ( ! xhrUnloadAbortInstalled ) {
 
-					xhrUnloadAbortMarker = [];
+					xhrUnloadAbortInstalled = 1;
 
 					jQuery(window).bind( "unload" , function() {
 
 						// Abort all pending requests
 						jQuery.each(xhrs, function(_, xhr) {
 							if ( xhr.onreadystatechange ) {
-								xhr.onreadystatechange( xhrUnloadAbortMarker );
+								xhr.onreadystatechange( 1 );
 							}
 						});
 
-						// Reset polling structure to be safe
-						xhrs = {};
-
 					});
 				}
 
-				var xhr = xhrPool.pop() || s.xhr(),
+				// Get a new xhr
+				var xhr = s.xhr(),
 					handle;
 
 				// Open the socket
@@ -58,7 +53,7 @@ jQuery.ajax.transport( function( s , determineDataType ) {
 				// Requested-With header
 				// Not set for crossDomain requests with no content
 				// (see why at http://trac.dojotoolkit.org/ticket/9486)
-				// Won't change header if already provided in beforeSend
+				// Won't change header if already provided
 				if ( ! ( s.crossDomain && ! s.hasContent ) && ! headers["x-requested-with"] ) {
 					headers["x-requested-with"] = "XMLHttpRequest";
 				}
@@ -76,49 +71,40 @@ jQuery.ajax.transport( function( s , determineDataType ) {
 				try {
 					xhr.send( ( s.hasContent && s.data ) || null );
 				} catch(e) {
-					// Store back in pool
-					xhrPool.push( xhr );
 					complete(0, "error", "" + e);
 					return;
 				}
 
 				// Listener
-				callback = function ( abortStatusText ) {
+				callback = function( _ , isAbort ) {
 
 					// Was never called and is aborted or complete
-					if ( callback && ( abortStatusText || xhr.readyState === 4 ) ) {
+					if ( callback && ( isAbort || xhr.readyState === 4 ) ) {
+
+						// Only called once
+						callback = 0;
 
-						// Do not listen anymore
-						// and Store back in pool
+						// Do not keep as active anymore
+						// and store back into pool
 						if (handle) {
 							xhr.onreadystatechange = jQuery.noop;
 							delete xhrs[ handle ];
-							handle = undefined;
-							xhrPool.push( xhr );
 						}
 
-						callback = 0;
-
-						// Get info
-						var status, statusText, response, responseHeaders;
-
-						if ( abortStatusText ) {
+						// If it's an abort
+						if ( isAbort ) {
 
+							// Abort it manually if needed
 							if ( xhr.readyState !== 4 ) {
 								xhr.abort();
 							}
-
-							// Stop here if unloadAbort
-							if ( abortStatusText === xhrUnloadAbortMarker ) {
-								return;
-							}
-
-							status = 0;
-							statusText = abortStatusText;
-
 						} else {
 
-							status = xhr.status;
+							// Get info
+							var status = xhr.status,
+								statusText,
+								response,
+								responseHeaders = xhr.getAllResponseHeaders();
 
 							try { // Firefox throws an exception when accessing statusText for faulty cross-domain requests
 
@@ -130,8 +116,6 @@ jQuery.ajax.transport( function( s , determineDataType ) {
 
 							}
 
-							responseHeaders = xhr.getAllResponseHeaders();
-
 							// Filter status for non standard behaviours
 							// (so many they seem to be the actual "standard")
 							status =
@@ -164,10 +148,10 @@ jQuery.ajax.transport( function( s , determineDataType ) {
 									xhr.getResponseHeader("content-type"),
 									xhr.responseText,
 									xhr.responseXML );
-						}
 
-						// Call complete
-						complete(status,statusText,response,responseHeaders);
+							// Call complete
+							complete(status,statusText,response,responseHeaders);
+						}
 					}
 				};
 
@@ -180,18 +164,16 @@ jQuery.ajax.transport( function( s , determineDataType ) {
 
 				} else {
 
-					// Listener is externalized to handle abort on unload
-					handle = xhrPollingId++;
+					// Add to list of active xhrs
+					handle = xhrId++;
 					xhrs[ handle ] = xhr;
-					xhr.onreadystatechange = function() {
-						callback();
-					};
+					xhr.onreadystatechange = callback;
 				}
 			},
 
-			abort: function(statusText) {
+			abort: function() {
 				if ( callback ) {
-					callback(statusText);
+					callback(0,1);
 				}
 			}
 		};
diff --git a/src/attributes.js b/src/attributes.js
index fec132340..d37400a68 100644
--- a/src/attributes.js
+++ b/src/attributes.js
@@ -133,11 +133,11 @@ jQuery.fn.extend({
 			} else if ( type === "undefined" || type === "boolean" ) {
 				if ( this.className ) {
 					// store className if set
-					jQuery.data( this, "__className__", this.className );
+					jQuery._data( this, "__className__", this.className );
 				}
 
 				// toggle whole className
-				this.className = this.className || value === false ? "" : jQuery.data( this, "__className__" ) || "";
+				this.className = this.className || value === false ? "" : jQuery._data( this, "__className__" ) || "";
 			}
 		});
 	},
diff --git a/src/core.js b/src/core.js
index b9e6d816f..4311e3103 100644
--- a/src/core.js
+++ b/src/core.js
@@ -3,7 +3,7 @@ var jQuery = (function() {
 // Define a local copy of jQuery
 var jQuery = function( selector, context ) {
 		// The jQuery object is actually just the init constructor 'enhanced'
-		return new jQuery.fn.init( selector, context );
+		return new jQuery.fn.init( selector, context, rootjQuery );
 	},
 
 	// Map over jQuery in case of overwrite
@@ -63,6 +63,9 @@ var jQuery = function( selector, context ) {
 	// The deferred used on DOM ready
 	readyList,
 
+	// Promise methods
+	promiseMethods = "then done fail isResolved isRejected promise".split( " " ),
+
 	// The ready event handler
 	DOMContentLoaded,
 
@@ -78,7 +81,8 @@ var jQuery = function( selector, context ) {
 	class2type = {};
 
 jQuery.fn = jQuery.prototype = {
-	init: function( selector, context ) {
+	constructor: jQuery,
+	init: function( selector, context, rootjQuery ) {
 		var match, elem, ret, doc;
 
 		// Handle $(""), $(null), or $(undefined)
@@ -112,6 +116,7 @@ jQuery.fn = jQuery.prototype = {
 
 				// HANDLE: $(html) -> $(array)
 				if ( match[1] ) {
+					context = context instanceof jQuery ? context[0] : context;
 					doc = (context ? context.ownerDocument || context : document);
 
 					// If a single string is passed in and it's a single tag
@@ -129,7 +134,7 @@ jQuery.fn = jQuery.prototype = {
 
 					} else {
 						ret = jQuery.buildFragment( [ match[1] ], [ doc ] );
-						selector = (ret.cacheable ? ret.fragment.cloneNode(true) : ret.fragment).childNodes;
+						selector = (ret.cacheable ? jQuery(ret.fragment).clone()[0] : ret.fragment).childNodes;
 					}
 
 					return jQuery.merge( this, selector );
@@ -171,7 +176,7 @@ jQuery.fn = jQuery.prototype = {
 			// HANDLE: $(expr, context)
 			// (which is just equivalent to: $(context).find(expr)
 			} else {
-				return jQuery( context ).find( selector );
+				return this.constructor( context ).find( selector );
 			}
 
 		// HANDLE: $(function)
@@ -222,7 +227,7 @@ jQuery.fn = jQuery.prototype = {
 	// (returning the new matched element set)
 	pushStack: function( elems, name, selector ) {
 		// Build a new jQuery matched element set
-		var ret = jQuery();
+		var ret = this.constructor();
 
 		if ( jQuery.isArray( elems ) ) {
 			push.apply( ret, elems );
@@ -287,7 +292,7 @@ jQuery.fn = jQuery.prototype = {
 	},
 
 	end: function() {
-		return this.prevObject || jQuery(null);
+		return this.prevObject || this.constructor(null);
 	},
 
 	// For internal use only.
@@ -578,7 +583,7 @@ jQuery.extend({
 
 			script.type = "text/javascript";
 
-			if ( jQuery.support.scriptEval ) {
+			if ( jQuery.support.scriptEval() ) {
 				script.appendChild( document.createTextNode( data ) );
 			} else {
 				script.text = data;
@@ -896,9 +901,10 @@ jQuery.extend({
 	Deferred: function( func ) {
 
 		var deferred = jQuery._Deferred(),
-			failDeferred = jQuery._Deferred();
+			failDeferred = jQuery._Deferred(),
+			promise;
 
-		// Add errorDeferred methods and redefine cancel
+		// Add errorDeferred methods, then and promise
 		jQuery.extend( deferred , {
 
 			then: function( doneCallbacks , failCallbacks ) {
@@ -911,14 +917,18 @@ jQuery.extend({
 			isRejected: failDeferred.isResolved,
 			// Get a promise for this deferred
 			// If obj is provided, the promise aspect is added to the object
-			promise: function( obj ) {
-				obj = obj || {};
-				jQuery.each( "then done fail isResolved isRejected".split( " " ) , function( _ , method ) {
-					obj[ method ] = deferred[ method ];
-				});
-				obj.promise = function() {
-					return obj;
-				};
+			// (i is used internally)
+			promise: function( obj , i ) {
+				if ( obj == null ) {
+					if ( promise ) {
+						return promise;
+					}
+					promise = obj = {};
+				}
+				i = promiseMethods.length;
+				while( i-- ) {
+					obj[ promiseMethods[ i ] ] = deferred[ promiseMethods[ i ] ];
+				}
 				return obj;
 			}
 
@@ -940,10 +950,32 @@ jQuery.extend({
 
 	// Deferred helper
 	when: function( object ) {
-		object = object && jQuery.isFunction( object.promise ) ?
-			object :
-			jQuery.Deferred().resolve( object );
-		return object.promise();
+		var args = arguments,
+			length = args.length,
+			deferred = length <= 1 && object && jQuery.isFunction( object.promise ) ?
+				object :
+				jQuery.Deferred(),
+			promise = deferred.promise(),
+			resolveArray;
+
+		if ( length > 1 ) {
+			resolveArray = new Array( length );
+			jQuery.each( args, function( index, element, args ) {
+				jQuery.when( element ).done( function( value ) {
+					args = arguments;
+					resolveArray[ index ] = args.length > 1 ? slice.call( args , 0 ) : value;
+					if( ! --length ) {
+						deferred.fire( promise, resolveArray );
+					}
+				}).fail( function() {
+					deferred.fireReject( promise, arguments );
+				});
+				return !deferred.isRejected();
+			});
+		} else if ( deferred !== object ) {
+			deferred.resolve( object );
+		}
+		return promise;
 	},
 
 	// Use of jQuery.browser is frowned upon.
@@ -960,6 +992,25 @@ jQuery.extend({
 		return { browser: match[1] || "", version: match[2] || "0" };
 	},
 
+	subclass: function(){
+		function jQuerySubclass( selector, context ) {
+			return new jQuerySubclass.fn.init( selector, context );
+		}
+		jQuerySubclass.superclass = this;
+		jQuerySubclass.fn = jQuerySubclass.prototype = this();
+		jQuerySubclass.fn.constructor = jQuerySubclass;
+		jQuerySubclass.subclass = this.subclass;
+		jQuerySubclass.fn.init = function init( selector, context ) {
+			if (context && context instanceof jQuery && !(context instanceof jQuerySubclass)){
+				context = jQuerySubclass(context);
+			}
+			return jQuery.fn.init.call( this, selector, context, rootjQuerySubclass );
+		};
+		jQuerySubclass.fn.init.prototype = jQuerySubclass.fn;
+		var rootjQuerySubclass = jQuerySubclass(document);
+		return jQuerySubclass;
+	},
+
 	browser: {}
 });
 
diff --git a/src/css.js b/src/css.js
index 8a83c6072..19c6342d2 100644
--- a/src/css.js
+++ b/src/css.js
@@ -263,8 +263,9 @@ if ( document.defaultView && document.defaultView.getComputedStyle ) {
 
 if ( document.documentElement.currentStyle ) {
 	currentStyle = function( elem, name ) {
-		var left, rsLeft,
+		var left, 
 			ret = elem.currentStyle && elem.currentStyle[ name ],
+			rsLeft = elem.runtimeStyle && elem.runtimeStyle[ name ],
 			style = elem.style;
 
 		// From the awesome hack by Dean Edwards
@@ -275,16 +276,19 @@ if ( document.documentElement.currentStyle ) {
 		if ( !rnumpx.test( ret ) && rnum.test( ret ) ) {
 			// Remember the original values
 			left = style.left;
-			rsLeft = elem.runtimeStyle.left;
 
 			// Put in the new values to get a computed value out
-			elem.runtimeStyle.left = elem.currentStyle.left;
+			if ( rsLeft ) {
+				elem.runtimeStyle.left = elem.currentStyle.left;
+			}
 			style.left = name === "fontSize" ? "1em" : (ret || 0);
 			ret = style.pixelLeft + "px";
 
 			// Revert the changed values
 			style.left = left;
-			elem.runtimeStyle.left = rsLeft;
+			if ( rsLeft ) {
+				elem.runtimeStyle.left = rsLeft;
+			}
 		}
 
 		return ret === "" ? "auto" : ret;
diff --git a/src/data.js b/src/data.js
index 4d1d1bd55..21f0e3a55 100644
--- a/src/data.js
+++ b/src/data.js
@@ -1,7 +1,6 @@
 (function( jQuery ) {
 
-var windowData = {},
-	rbrace = /^(?:\{.*\}|\[.*\])$/;
+var rbrace = /^(?:\{.*\}|\[.*\])$/;
 
 jQuery.extend({
 	cache: {},
@@ -23,110 +22,170 @@ jQuery.extend({
 	},
 
 	hasData: function( elem ) {
-		if ( elem.nodeType ) {
-			elem = jQuery.cache[ elem[jQuery.expando] ];
-		}
+		elem = elem.nodeType ? jQuery.cache[ elem[jQuery.expando] ] : elem[ jQuery.expando ];
 
 		return !!elem && !jQuery.isEmptyObject(elem);
 	},
 
-	data: function( elem, name, data ) {
+	data: function( elem, name, data, pvt /* Internal Use Only */ ) {
 		if ( !jQuery.acceptData( elem ) ) {
 			return;
 		}
 
-		elem = elem == window ?
-			windowData :
-			elem;
+		var internalKey = jQuery.expando, getByName = typeof name === "string", thisCache,
+
+			// We have to handle DOM nodes and JS objects differently because IE6-7
+			// can't GC object references properly across the DOM-JS boundary
+			isNode = elem.nodeType,
+
+			// Only DOM nodes need the global jQuery cache; JS object data is
+			// attached directly to the object so GC can occur automatically
+			cache = isNode ? jQuery.cache : elem,
 
-		var isNode = elem.nodeType,
-			id = isNode ? elem[ jQuery.expando ] : null,
-			cache = jQuery.cache, thisCache;
+			// Only defining an ID for JS objects if its cache already exists allows
+			// the code to shortcut on the same path as a DOM node with no cache
+			id = isNode ? elem[ jQuery.expando ] : elem[ jQuery.expando ] && jQuery.expando;
 
-		if ( isNode && !id && typeof name === "string" && data === undefined ) {
+		// Avoid doing any more work than we need to when trying to get data on an
+		// object that has no data at all
+		if ( (!id || (pvt && id && !cache[ id ][ internalKey ])) && getByName && data === undefined ) {
 			return;
 		}
 
-		// Get the data from the object directly
-		if ( !isNode ) {
-			cache = elem;
+		if ( !id ) {
+			// Only DOM nodes need a new unique ID for each element since their data
+			// ends up in the global cache
+			if ( isNode ) {
+				elem[ jQuery.expando ] = id = ++jQuery.uuid;
+			} else {
+				id = jQuery.expando;
+			}
+		}
 
-		// Compute a unique ID for the element
-		} else if ( !id ) {
-			elem[ jQuery.expando ] = id = ++jQuery.uuid;
+		if ( !cache[ id ] ) {
+			cache[ id ] = {};
 		}
 
-		// Avoid generating a new cache unless none exists and we
-		// want to manipulate it.
+		// An object can be passed to jQuery.data instead of a key/value pair; this gets
+		// shallow copied over onto the existing cache
 		if ( typeof name === "object" ) {
-			if ( isNode ) {
+			if ( pvt ) {
+				cache[ id ][ internalKey ] = jQuery.extend(cache[ id ][ internalKey ], name);
+			} else {
 				cache[ id ] = jQuery.extend(cache[ id ], name);
+			}
+		}
 
-			} else {
-				jQuery.extend( cache, name );
+		thisCache = cache[ id ];
+
+		// Internal jQuery data is stored in a separate object inside the object's data
+		// cache in order to avoid key collisions between internal data and user-defined
+		// data
+		if ( pvt ) {
+			if ( !thisCache[ internalKey ] ) {
+				thisCache[ internalKey ] = {};
 			}
 
-		} else if ( isNode && !cache[ id ] ) {
-			cache[ id ] = {};
+			thisCache = thisCache[ internalKey ];
 		}
 
-		thisCache = isNode ? cache[ id ] : cache;
-
-		// Prevent overriding the named cache with undefined values
 		if ( data !== undefined ) {
 			thisCache[ name ] = data;
 		}
 
-		return typeof name === "string" ? thisCache[ name ] : thisCache;
+		// TODO: This is a hack for 1.5 ONLY. It will be removed in 1.6. Users should
+		// not attempt to inspect the internal events object using jQuery.data, as this
+		// internal data object is undocumented and subject to change.
+		if ( name === "events" && !thisCache[name] ) {
+			return thisCache[ internalKey ] && thisCache[ internalKey ].events;
+		}
+
+		return getByName ? thisCache[ name ] : thisCache;
 	},
 
-	removeData: function( elem, name ) {
+	removeData: function( elem, name, pvt /* Internal Use Only */ ) {
 		if ( !jQuery.acceptData( elem ) ) {
 			return;
 		}
 
-		elem = elem == window ?
-			windowData :
-			elem;
+		var internalKey = jQuery.expando, isNode = elem.nodeType,
+
+			// See jQuery.data for more information
+			cache = isNode ? jQuery.cache : elem,
 
-		var isNode = elem.nodeType,
-			id = isNode ? elem[ jQuery.expando ] : elem,
-			cache = jQuery.cache,
-			thisCache = isNode ? cache[ id ] : id;
+			// See jQuery.data for more information
+			id = isNode ? elem[ jQuery.expando ] : jQuery.expando;
+
+		// If there is already no cache entry for this object, there is no
+		// purpose in continuing
+		if ( !cache[ id ] ) {
+			return;
+		}
 
-		// If we want to remove a specific section of the element's data
 		if ( name ) {
+			var thisCache = pvt ? cache[ id ][ internalKey ] : cache[ id ];
+
 			if ( thisCache ) {
-				// Remove the section of cache data
 				delete thisCache[ name ];
 
-				// If we've removed all the data, remove the element's cache
-				if ( isNode && jQuery.isEmptyObject(thisCache) ) {
-					jQuery.removeData( elem );
+				// If there is no data left in the cache, we want to continue
+				// and let the cache object itself get destroyed
+				if ( !jQuery.isEmptyObject(thisCache) ) {
+					return;
 				}
 			}
+		}
+
+		// See jQuery.data for more information
+		if ( pvt ) {
+			delete cache[ id ][ internalKey ];
+
+			// Don't destroy the parent cache unless the internal data object
+			// had been the only thing left in it
+			if ( !jQuery.isEmptyObject(cache[ id ]) ) {
+				return;
+			}
+		}
+
+		var internalCache = cache[ id ][ internalKey ];
 
-		// Otherwise, we want to remove all of the element's data
+		// Browsers that fail expando deletion also refuse to delete expandos on
+		// the window, but it will allow it on all other JS objects; other browsers
+		// don't care
+		if ( jQuery.support.deleteExpando || cache != window ) {
+			delete cache[ id ];
 		} else {
-			if ( isNode && jQuery.support.deleteExpando ) {
-				delete elem[ jQuery.expando ];
+			cache[ id ] = null;
+		}
 
+		// We destroyed the entire user cache at once because it's faster than
+		// iterating through each key, but we need to continue to persist internal
+		// data if it existed
+		if ( internalCache ) {
+			cache[ id ] = {};
+			cache[ id ][ internalKey ] = internalCache;
+
+		// Otherwise, we need to eliminate the expando on the node to avoid
+		// false lookups in the cache for entries that no longer exist
+		} else if ( isNode ) {
+			// IE does not allow us to delete expando properties from nodes,
+			// nor does it have a removeAttribute function on Document nodes;
+			// we must handle all of these cases
+			if ( jQuery.support.deleteExpando ) {
+				delete elem[ jQuery.expando ];
 			} else if ( elem.removeAttribute ) {
 				elem.removeAttribute( jQuery.expando );
-
-			// Completely remove the data cache
-			} else if ( isNode ) {
-				delete cache[ id ];
-
-			// Remove all fields from the object
 			} else {
-				for ( var n in elem ) {
-					delete elem[ n ];
-				}
+				elem[ jQuery.expando ] = null;
 			}
 		}
 	},
 
+	// For internal use only.
+	_data: function( elem, name, data ) {
+		return jQuery.data( elem, name, data, true );
+	},
+
 	// A method for determining if a DOM node can handle the data expando
 	acceptData: function( elem ) {
 		if ( elem.nodeName ) {
diff --git a/src/effects.js b/src/effects.js
index bd57ffc3d..b0675395f 100644
--- a/src/effects.js
+++ b/src/effects.js
@@ -27,7 +27,7 @@ jQuery.fn.extend({
 
 				// Reset the inline display of this element to learn if it is
 				// being hidden by cascaded rules or not
-				if ( !jQuery.data(elem, "olddisplay") && display === "none" ) {
+				if ( !jQuery._data(elem, "olddisplay") && display === "none" ) {
 					display = elem.style.display = "";
 				}
 
@@ -35,7 +35,7 @@ jQuery.fn.extend({
 				// in a stylesheet to whatever the default browser style is
 				// for such an element
 				if ( display === "" && jQuery.css( elem, "display" ) === "none" ) {
-					jQuery.data(elem, "olddisplay", defaultDisplay(elem.nodeName));
+					jQuery._data(elem, "olddisplay", defaultDisplay(elem.nodeName));
 				}
 			}
 
@@ -46,7 +46,7 @@ jQuery.fn.extend({
 				display = elem.style.display;
 
 				if ( display === "" || display === "none" ) {
-					elem.style.display = jQuery.data(elem, "olddisplay") || "";
+					elem.style.display = jQuery._data(elem, "olddisplay") || "";
 				}
 			}
 
@@ -62,8 +62,8 @@ jQuery.fn.extend({
 			for ( var i = 0, j = this.length; i < j; i++ ) {
 				var display = jQuery.css( this[i], "display" );
 
-				if ( display !== "none" && !jQuery.data( this[i], "olddisplay" ) ) {
-					jQuery.data( this[i], "olddisplay", display );
+				if ( display !== "none" && !jQuery._data( this[i], "olddisplay" ) ) {
+					jQuery._data( this[i], "olddisplay", display );
 				}
 			}
 
diff --git a/src/event.js b/src/event.js
index 675e5fff3..2ddf28812 100644
--- a/src/event.js
+++ b/src/event.js
@@ -8,7 +8,8 @@ var rnamespaces = /\.(.*)$/,
 	fcleanup = function( nm ) {
 		return nm.replace(rescape, "\\$&");
 	},
-	focusCounts = { focusin: 0, focusout: 0 };
+	focusCounts = { focusin: 0, focusout: 0 },
+	eventKey = "events";
 
 /*
  * A number of helper functions used for managing events.
@@ -50,7 +51,7 @@ jQuery.event = {
 		}
 
 		// Init the element's event structure
-		var elemData = jQuery.data( elem );
+		var elemData = jQuery._data( elem );
 
 		// If no elemData is found then we must be trying to bind to one of the
 		// banned noData elements
@@ -58,10 +59,7 @@ jQuery.event = {
 			return;
 		}
 
-		// Use a key less likely to result in collisions for plain JS objects.
-		// Fixes bug #7150.
-		var eventKey = elem.nodeType ? "events" : "__events__",
-			events = elemData[ eventKey ],
+		var events = elemData[ eventKey ],
 			eventHandle = elemData.handle;
 
 		if ( typeof events === "function" ) {
@@ -177,8 +175,7 @@ jQuery.event = {
 		}
 
 		var ret, type, fn, j, i = 0, all, namespaces, namespace, special, eventType, handleObj, origType,
-			eventKey = elem.nodeType ? "events" : "__events__",
-			elemData = jQuery.data( elem ),
+			elemData = jQuery.hasData( elem ) && jQuery._data( elem ),
 			events = elemData && elemData[ eventKey ];
 
 		if ( !elemData || !events ) {
@@ -290,10 +287,10 @@ jQuery.event = {
 			delete elemData.handle;
 
 			if ( typeof elemData === "function" ) {
-				jQuery.removeData( elem, eventKey );
+				jQuery.removeData( elem, eventKey, true );
 
 			} else if ( jQuery.isEmptyObject( elemData ) ) {
-				jQuery.removeData( elem );
+				jQuery.removeData( elem, undefined, true );
 			}
 		}
 	},
@@ -325,9 +322,16 @@ jQuery.event = {
 
 				// Only trigger if we've ever bound an event for it
 				if ( jQuery.event.global[ type ] ) {
+					// XXX This code smells terrible. event.js should not be directly
+					// inspecting the data cache
 					jQuery.each( jQuery.cache, function() {
-						if ( this.events && this.events[type] ) {
-							jQuery.event.trigger( event, data, this.handle.elem );
+						// internalKey variable is just used to make it easier to find
+						// and potentially change this stuff later; currently it just
+						// points to jQuery.expando
+						var internalKey = jQuery.expando,
+							internalCache = this[ internalKey ];
+						if ( internalCache && internalCache.events && internalCache.events[type] ) {
+							jQuery.event.trigger( event, data, internalCache.handle.elem );
 						}
 					});
 				}
@@ -353,8 +357,8 @@ jQuery.event = {
 
 		// Trigger the event, it is assumed that "handle" is a function
 		var handle = elem.nodeType ?
-			jQuery.data( elem, "handle" ) :
-			(jQuery.data( elem, "__events__" ) || {}).handle;
+			jQuery._data( elem, "handle" ) :
+			(jQuery._data( elem, eventKey ) || {}).handle;
 
 		if ( handle ) {
 			handle.apply( elem, data );
@@ -432,7 +436,7 @@ jQuery.event = {
 
 		event.namespace = event.namespace || namespace_sort.join(".");
 
-		events = jQuery.data(this, this.nodeType ? "events" : "__events__");
+		events = jQuery._data(this, eventKey);
 
 		if ( typeof events === "function" ) {
 			events = events.events;
@@ -603,7 +607,7 @@ jQuery.Event = function( src ) {
 
 		// Events bubbling up the document may have been marked as prevented
 		// by a handler lower down the tree; reflect the correct value.
-		this.isDefaultPrevented = (src.defaultPrevented || src.returnValue === false ||
+		this.isDefaultPrevented = (src.defaultPrevented || src.returnValue === false || 
 			src.getPreventDefault && src.getPreventDefault()) ? returnTrue : returnFalse;
 
 	// Event type
@@ -787,12 +791,12 @@ if ( !jQuery.support.changeBubbles ) {
 			return;
 		}
 
-		data = jQuery.data( elem, "_change_data" );
+		data = jQuery._data( elem, "_change_data" );
 		val = getVal(elem);
 
 		// the current data will be also retrieved by beforeactivate
 		if ( e.type !== "focusout" || elem.type !== "radio" ) {
-			jQuery.data( elem, "_change_data", val );
+			jQuery._data( elem, "_change_data", val );
 		}
 
 		if ( data === undefined || val === data ) {
@@ -837,7 +841,7 @@ if ( !jQuery.support.changeBubbles ) {
 			// information
 			beforeactivate: function( e ) {
 				var elem = e.target;
-				jQuery.data( elem, "_change_data", getVal(elem) );
+				jQuery._data( elem, "_change_data", getVal(elem) );
 			}
 		},
 
@@ -986,8 +990,8 @@ jQuery.fn.extend({
 
 		return this.click( jQuery.proxy( fn, function( event ) {
 			// Figure out which function to execute
-			var lastToggle = ( jQuery.data( this, "lastToggle" + fn.guid ) || 0 ) % i;
-			jQuery.data( this, "lastToggle" + fn.guid, lastToggle + 1 );
+			var lastToggle = ( jQuery._data( this, "lastToggle" + fn.guid ) || 0 ) % i;
+			jQuery._data( this, "lastToggle" + fn.guid, lastToggle + 1 );
 
 			// Make sure that clicks stop
 			event.preventDefault();
@@ -1075,7 +1079,7 @@ function liveHandler( event ) {
 	var stop, maxLevel, related, match, handleObj, elem, j, i, l, data, close, namespace, ret,
 		elems = [],
 		selectors = [],
-		events = jQuery.data( this, this.nodeType ? "events" : "__events__" );
+		events = jQuery._data( this, eventKey );
 
 	if ( typeof events === "function" ) {
 		events = events.events;
diff --git a/src/manipulation.js b/src/manipulation.js
index 493082212..596a45736 100644
--- a/src/manipulation.js
+++ b/src/manipulation.js
@@ -346,7 +346,7 @@ jQuery.fn.extend({
 						table ?
 							root(this[i], first) :
 							this[i],
-						i > 0 || results.cacheable || this.length > 1  ?
+						i > 0 || results.cacheable || (this.length > 1 && i > 0) ?
 							jQuery(fragment).clone(true)[0] :
 							fragment
 					);
@@ -381,17 +381,24 @@ function cloneCopyEvent(orig, ret) {
 			throw "Cloned data mismatch";
 		}
 
-		var oldData = jQuery.data( orig[nodeIndex] ),
-			curData = jQuery.data( this, oldData ),
-			events = oldData && oldData.events;
+		var internalKey = jQuery.expando,
+			oldData = jQuery.data( orig[nodeIndex] ),
+			curData = jQuery.data( this, oldData );
 
-		if ( events ) {
-			delete curData.handle;
-			curData.events = {};
+		// Switch to use the internal data object, if it exists, for the next
+		// stage of data copying
+		if ( (oldData = oldData[ internalKey ]) ) {
+			var events = oldData.events;
+			curData = curData[ internalKey ] = jQuery.extend({}, oldData);
 
-			for ( var type in events ) {
-				for ( var i = 0, l = events[ type ].length; i < l; i++ ) {
-					jQuery.event.add( this, type, events[ type ][ i ], events[ type ][ i ].data );
+			if ( events ) {
+				delete curData.handle;
+				curData.events = {};
+
+				for ( var type in events ) {
+					for ( var i = 0, l = events[ type ].length; i < l; i++ ) {
+						jQuery.event.add( this, type, events[ type ][ i ], events[ type ][ i ].data );
+					}
 				}
 			}
 		}
@@ -420,15 +427,29 @@ function cloneFixAttributes(src, dest) {
 	if ( nodeName === "object" ) {
 		dest.outerHTML = src.outerHTML;
 
-	// IE6-8 fails to persist the checked state of a cloned checkbox
-	// or radio button
-	} else if ( nodeName === "input" && src.checked ) {
-		dest.defaultChecked = dest.checked = src.checked;
+	} else if ( nodeName === "input" && (src.type === "checkbox" || src.type === "radio") ) {
+		// IE6-8 fails to persist the checked state of a cloned checkbox
+		// or radio button. Worse, IE6-7 fail to give the cloned element
+		// a checked appearance if the defaultChecked value isn't also set
+		if ( src.checked ) {
+			dest.defaultChecked = dest.checked = src.checked;
+		}
+
+		// IE6-7 get confused and end up setting the value of a cloned
+		// checkbox/radio button to an empty string instead of "on"
+		if ( dest.value !== src.value ) {
+			dest.value = src.value;
+		}
 
 	// IE6-8 fails to return the selected option to the default selected
 	// state when cloning options
 	} else if ( nodeName === "option" ) {
 		dest.selected = src.defaultSelected;
+
+	// IE6-8 fails to set the defaultValue to the correct value when
+	// cloning other types of input fields
+	} else if ( nodeName === "input" || nodeName === "textarea" ) {
+		dest.defaultValue = src.defaultValue;
 	}
 
 	// Event data gets referenced instead of copied if the expando
@@ -594,8 +615,7 @@ jQuery.extend({
 	},
 
 	cleanData: function( elems ) {
-		var data, id, cache = jQuery.cache,
-			special = jQuery.event.special,
+		var data, id, cache = jQuery.cache, internalKey = jQuery.expando, special = jQuery.event.special,
 			deleteExpando = jQuery.support.deleteExpando;
 
 		for ( var i = 0, elem; (elem = elems[i]) != null; i++ ) {
@@ -606,13 +626,14 @@ jQuery.extend({
 			id = elem[ jQuery.expando ];
 
 			if ( id ) {
-				data = cache[ id ];
+				data = cache[ id ] && cache[ id ][ internalKey ];
 
 				if ( data && data.events ) {
 					for ( var type in data.events ) {
 						if ( special[ type ] ) {
 							jQuery.event.remove( elem, type );
 
+						// This is a shortcut to avoid jQuery.event.remove's overhead
 						} else {
 							jQuery.removeEvent( elem, type, data.handle );
 						}
diff --git a/src/queue.js b/src/queue.js
index 735b0e189..9e3e2fb52 100644
--- a/src/queue.js
+++ b/src/queue.js
@@ -7,7 +7,7 @@ jQuery.extend({
 		}
 
 		type = (type || "fx") + "queue";
-		var q = jQuery.data( elem, type );
+		var q = jQuery._data( elem, type );
 
 		// Speed up dequeue by getting out quickly if this is just a lookup
 		if ( !data ) {
@@ -15,7 +15,7 @@ jQuery.extend({
 		}
 
 		if ( !q || jQuery.isArray(data) ) {
-			q = jQuery.data( elem, type, jQuery.makeArray(data) );
+			q = jQuery._data( elem, type, jQuery.makeArray(data) );
 
 		} else {
 			q.push( data );
@@ -46,6 +46,10 @@ jQuery.extend({
 				jQuery.dequeue(elem, type);
 			});
 		}
+
+		if ( !queue.length ) {
+			jQuery.removeData( elem, type + "queue", true );
+		}
 	}
 });
 
diff --git a/src/support.js b/src/support.js
index e4c3ea916..f502811ae 100644
--- a/src/support.js
+++ b/src/support.js
@@ -4,10 +4,7 @@
 
 	jQuery.support = {};
 
-	var root = document.documentElement,
-		script = document.createElement("script"),
-		div = document.createElement("div"),
-		id = "script" + jQuery.now();
+	var div = document.createElement("div");
 
 	div.style.display = "none";
 	div.innerHTML = "   <link/><table></table><a href='/a' style='color:red;float:left;opacity:.55;'>a</a><input type='checkbox'/>";
@@ -64,7 +61,7 @@
 		deleteExpando: true,
 		optDisabled: false,
 		checkClone: false,
-		scriptEval: false,
+		_scriptEval: null,
 		noCloneEvent: true,
 		boxModel: null,
 		inlineBlockNeedsLayout: false,
@@ -77,32 +74,45 @@
 	select.disabled = true;
 	jQuery.support.optDisabled = !opt.disabled;
 
-	script.type = "text/javascript";
-	try {
-		script.appendChild( document.createTextNode( "window." + id + "=1;" ) );
-	} catch(e) {}
-
-	root.insertBefore( script, root.firstChild );
-
-	// Make sure that the execution of code works by injecting a script
-	// tag with appendChild/createTextNode
-	// (IE doesn't support this, fails, and uses .text instead)
-	if ( window[ id ] ) {
-		jQuery.support.scriptEval = true;
-		delete window[ id ];
-	}
+	jQuery.support.scriptEval = function() {
+		if ( jQuery.support._scriptEval === null) {
+			var root = document.documentElement,
+				script = document.createElement("script"),
+				id = "script" + jQuery.now();
+
+			script.type = "text/javascript";
+			try {
+				script.appendChild( document.createTextNode( "window." + id + "=1;" ) );
+			} catch(e) {}
+
+			root.insertBefore( script, root.firstChild );
+
+			// Make sure that the execution of code works by injecting a script
+			// tag with appendChild/createTextNode
+			// (IE doesn't support this, fails, and uses .text instead)
+			if ( window[ id ] ) {
+				jQuery.support._scriptEval = true;
+				delete window[ id ];
+			} else {
+				jQuery.support._scriptEval = false;
+			}
+
+			root.removeChild( script );
+			// release memory in IE
+			root = script = id  = null;
+		}
+		return jQuery.support._scriptEval;
+	};
 
 	// Test to see if it's possible to delete an expando from an element
 	// Fails in Internet Explorer
 	try {
-		delete script.test;
+		delete div.test;
 
 	} catch(e) {
 		jQuery.support.deleteExpando = false;
 	}
 
-	root.removeChild( script );
-
 	if ( div.attachEvent && div.fireEvent ) {
 		div.attachEvent("onclick", function click() {
 			// Cloning a node shouldn't copy over any
@@ -191,6 +201,6 @@
 	jQuery.support.changeBubbles = eventSupported("change");
 
 	// release memory in IE
-	root = script = div = all = a = null;
+	div = all = a = null;
 })();
 })( jQuery );
diff --git a/src/traversing.js b/src/traversing.js
index 689e90196..b36ce3db8 100644
--- a/src/traversing.js
+++ b/src/traversing.js
@@ -6,7 +6,14 @@ var runtil = /Until$/,
 	rmultiselector = /,/,
 	isSimple = /^.[^:#\[\.,]*$/,
 	slice = Array.prototype.slice,
-	POS = jQuery.expr.match.POS;
+	POS = jQuery.expr.match.POS,
+	// methods guaranteed to produce a unique set when starting from a unique set
+	guaranteedUnique = {
+		children: true,
+		contents: true,
+		next: true,
+		prev: true
+	};
 
 jQuery.fn.extend({
 	find: function( selector ) {
@@ -196,7 +203,8 @@ jQuery.each({
 	}
 }, function( name, fn ) {
 	jQuery.fn[ name ] = function( until, selector ) {
-		var ret = jQuery.map( this, fn, until );
+		var ret = jQuery.map( this, fn, until ),
+        args = slice.call(arguments);
 
 		if ( !runtil.test( name ) ) {
 			selector = until;
@@ -206,13 +214,13 @@ jQuery.each({
 			ret = jQuery.filter( selector, ret );
 		}
 
-		ret = this.length > 1 ? jQuery.unique( ret ) : ret;
+		ret = this.length > 1 && !guaranteedUnique[ name ] ? jQuery.unique( ret ) : ret;
 
 		if ( (this.length > 1 || rmultiselector.test( selector )) && rparentsprev.test( name ) ) {
 			ret = ret.reverse();
 		}
 
-		return this.pushStack( ret, name, slice.call(arguments).join(",") );
+		return this.pushStack( ret, name, args.join(",") );
 	};
 });