diff --git a/VERSION b/VERSION
index 276cbf9e..2eca1561 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.3.0
+2.4.0rc1
diff --git a/bin/templates/project/assets/www/index.html b/bin/templates/project/assets/www/index.html
index 92b61beb..d45ae9fb 100644
--- a/bin/templates/project/assets/www/index.html
+++ b/bin/templates/project/assets/www/index.html
@@ -33,7 +33,7 @@
                 <p class="event received">Device is Ready</p>
             </div>
         </div>
-        <script type="text/javascript" src="cordova-2.3.0.js"></script>
+        <script type="text/javascript" src="cordova-2.4.0rc1.js"></script>
         <script type="text/javascript" src="js/index.js"></script>
         <script type="text/javascript">
             app.initialize();
diff --git a/framework/assets/js/cordova.android.js b/framework/assets/js/cordova.android.js
index 42b6aa6a..8d8b8088 100644
--- a/framework/assets/js/cordova.android.js
+++ b/framework/assets/js/cordova.android.js
@@ -1,6 +1,6 @@
-// commit 4082ee0ba3a8902cba7bd087d0584bb7534e694b
+// commit f43f1dfbced6bde0048efd77d7632aaed3cac7fa
 
-// File generated at :: Wed Jan 02 2013 16:43:38 GMT-0800 (PST)
+// File generated at :: Fri Jan 18 2013 15:30:17 GMT-0800 (PST)
 
 /*
  Licensed to the Apache Software Foundation (ASF) under one
@@ -320,6 +320,8 @@ module.exports = cordova;
 define("cordova/argscheck", function(require, exports, module) {
 
 var exec = require('cordova/exec');
+var utils = require('cordova/utils');
+
 var moduleExports = module.exports;
 
 var typeMap = {
@@ -340,7 +342,7 @@ function checkArgs(spec, functionName, args, opt_callee) {
         return;
     }
     var errMsg = null;
-    var type;
+    var typeName;
     for (var i = 0; i < spec.length; ++i) {
         var c = spec.charAt(i),
             cUpper = c.toUpperCase(),
@@ -349,17 +351,17 @@ function checkArgs(spec, functionName, args, opt_callee) {
         if (c == '*') {
             continue;
         }
-        type = Object.prototype.toString.call(arg).slice(8, -1);
+        typeName = utils.typeName(arg);
         if ((arg === null || arg === undefined) && c == cUpper) {
             continue;
         }
-        if (type != typeMap[cUpper]) {
+        if (typeName != typeMap[cUpper]) {
             errMsg = 'Expected ' + typeMap[cUpper];
             break;
         }
     }
     if (errMsg) {
-        errMsg += ', but got ' + type + '.';
+        errMsg += ', but got ' + typeName + '.';
         errMsg = 'Wrong type for parameter "' + extractParamName(opt_callee || args.callee, i) + '" of ' + functionName + ': ' + errMsg;
         // Don't log when running jake test.
         if (typeof jasmine == 'undefined') {
@@ -369,7 +371,12 @@ function checkArgs(spec, functionName, args, opt_callee) {
     }
 }
 
+function getValue(value, defaultValue) {
+    return value === undefined ? defaultValue : value;
+}
+
 moduleExports.checkArgs = checkArgs;
+moduleExports.getValue = getValue;
 moduleExports.enableChecks = true;
 
 
@@ -1043,6 +1050,13 @@ function androidExec(success, fail, service, action, args) {
         androidExec.setJsToNativeBridgeMode(jsToNativeModes.JS_OBJECT);
     }
 
+    // Process any ArrayBuffers in the args into a string.
+    for (var i = 0; i < args.length; i++) {
+        if (args[i].constructor == ArrayBuffer || (args[i].buffer && args[i].buffer.constructor == ArrayBuffer)) {
+            args[i] = window.btoa(String.fromCharCode.apply(null, new Uint8Array(args[i])));
+        }
+    }
+
     var callbackId = service + cordova.callbackId++,
         argsJson = JSON.stringify(args),
         returnValue;
@@ -1157,6 +1171,14 @@ function processMessage(message) {
                 payload = null;
             } else if (payloadKind == 'n') {
                 payload = +message.slice(nextSpaceIdx + 2);
+            } else if (payloadKind == 'A') {
+                var data = message.slice(nextSpaceIdx + 2);
+                var bytes = window.atob(data);
+                var arraybuffer = new Uint8Array(bytes.length);
+                for (var i = 0; i < bytes.length; i++) {
+                    arraybuffer[i] = bytes.charCodeAt(i);
+                }
+                payload = arraybuffer.buffer;
             } else {
                 payload = JSON.parse(message.slice(nextSpaceIdx + 1));
             }
@@ -1334,7 +1356,8 @@ module.exports = Acceleration;
 // file: lib/common/plugin/Camera.js
 define("cordova/plugin/Camera", function(require, exports, module) {
 
-var exec = require('cordova/exec'),
+var argscheck = require('cordova/argscheck'),
+    exec = require('cordova/exec'),
     Camera = require('cordova/plugin/CameraConstants');
 
 var cameraExport = {};
@@ -1355,90 +1378,21 @@ for (var key in Camera) {
  * @param {Object} options
  */
 cameraExport.getPicture = function(successCallback, errorCallback, options) {
+    argscheck.checkArgs('fFO', 'Camera.getPicture', arguments);
     options = options || {};
-    // successCallback required
-    if (typeof successCallback != "function") {
-        console.log("Camera Error: successCallback is not a function");
-        return;
-    }
+    var getValue = argscheck.getValue;
 
-    // errorCallback optional
-    if (errorCallback && (typeof errorCallback != "function")) {
-        console.log("Camera Error: errorCallback is not a function");
-        return;
-    }
-
-    var quality = 50;
-    if (typeof options.quality == "number") {
-        quality = options.quality;
-    } else if (typeof options.quality == "string") {
-        var qlity = parseInt(options.quality, 10);
-        if (isNaN(qlity) === false) {
-            quality = qlity.valueOf();
-        }
-    }
-
-    var destinationType = Camera.DestinationType.FILE_URI;
-    if (typeof options.destinationType == "number") {
-        destinationType = options.destinationType;
-    }
-
-    var sourceType = Camera.PictureSourceType.CAMERA;
-    if (typeof options.sourceType == "number") {
-        sourceType = options.sourceType;
-    }
-
-    var targetWidth = -1;
-    if (typeof options.targetWidth == "number") {
-        targetWidth = options.targetWidth;
-    } else if (typeof options.targetWidth == "string") {
-        var width = parseInt(options.targetWidth, 10);
-        if (isNaN(width) === false) {
-            targetWidth = width.valueOf();
-        }
-    }
-
-    var targetHeight = -1;
-    if (typeof options.targetHeight == "number") {
-        targetHeight = options.targetHeight;
-    } else if (typeof options.targetHeight == "string") {
-        var height = parseInt(options.targetHeight, 10);
-        if (isNaN(height) === false) {
-            targetHeight = height.valueOf();
-        }
-    }
-
-    var encodingType = Camera.EncodingType.JPEG;
-    if (typeof options.encodingType == "number") {
-        encodingType = options.encodingType;
-    }
-
-    var mediaType = Camera.MediaType.PICTURE;
-    if (typeof options.mediaType == "number") {
-        mediaType = options.mediaType;
-    }
-    var allowEdit = false;
-    if (typeof options.allowEdit == "boolean") {
-        allowEdit = options.allowEdit;
-    } else if (typeof options.allowEdit == "number") {
-        allowEdit = options.allowEdit <= 0 ? false : true;
-    }
-    var correctOrientation = false;
-    if (typeof options.correctOrientation == "boolean") {
-        correctOrientation = options.correctOrientation;
-    } else if (typeof options.correctOrientation == "number") {
-        correctOrientation = options.correctOrientation <=0 ? false : true;
-    }
-    var saveToPhotoAlbum = false;
-    if (typeof options.saveToPhotoAlbum == "boolean") {
-        saveToPhotoAlbum = options.saveToPhotoAlbum;
-    } else if (typeof options.saveToPhotoAlbum == "number") {
-        saveToPhotoAlbum = options.saveToPhotoAlbum <=0 ? false : true;
-    }
-    var popoverOptions = null;
-    if (typeof options.popoverOptions == "object") {
-        popoverOptions = options.popoverOptions;
-    }
+    var quality = getValue(options.quality, 50);
+    var destinationType = getValue(options.destinationType, Camera.DestinationType.FILE_URI);
+    var sourceType = getValue(options.sourceType, Camera.PictureSourceType.CAMERA);
+    var targetWidth = getValue(options.targetWidth, -1);
+    var targetHeight = getValue(options.targetHeight, -1);
+    var encodingType = getValue(options.encodingType, Camera.EncodingType.JPEG);
+    var mediaType = getValue(options.mediaType, Camera.MediaType.PICTURE);
+    var allowEdit = !!options.allowEdit;
+    var correctOrientation = !!options.correctOrientation;
+    var saveToPhotoAlbum = !!options.saveToPhotoAlbum;
+    var popoverOptions = getValue(options.popoverOptions, null);
 
     var args = [quality, destinationType, sourceType, targetWidth, targetHeight, encodingType,
                 mediaType, allowEdit, correctOrientation, saveToPhotoAlbum, popoverOptions];
@@ -1460,7 +1414,8 @@ define("cordova/plugin/CameraConstants", function(require, exports, module) {
 module.exports = {
   DestinationType:{
     DATA_URL: 0,         // Return base64 encoded string
-    FILE_URI: 1          // Return file uri (content://media/external/images/media/2 for Android)
+    FILE_URI: 1,         // Return file uri (content://media/external/images/media/2 for Android)
+    NATIVE_URI: 2        // Return native uri (eg. asset-library://... for iOS)
   },
   EncodingType:{
     JPEG: 0,             // Return JPEG encoded image
@@ -1612,10 +1567,10 @@ module.exports = CompassError;
 define("cordova/plugin/CompassHeading", function(require, exports, module) {
 
 var CompassHeading = function(magneticHeading, trueHeading, headingAccuracy, timestamp) {
-  this.magneticHeading = (magneticHeading !== undefined ? magneticHeading : null);
-  this.trueHeading = (trueHeading !== undefined ? trueHeading : null);
-  this.headingAccuracy = (headingAccuracy !== undefined ? headingAccuracy : null);
-  this.timestamp = (timestamp !== undefined ? timestamp : new Date().getTime());
+  this.magneticHeading = magneticHeading || null;
+  this.trueHeading = trueHeading || null;
+  this.headingAccuracy = headingAccuracy || null;
+  this.timestamp = timestamp || new Date().getTime();
 };
 
 module.exports = CompassHeading;
@@ -1664,7 +1619,8 @@ module.exports = {
 // file: lib/common/plugin/Contact.js
 define("cordova/plugin/Contact", function(require, exports, module) {
 
-var exec = require('cordova/exec'),
+var argscheck = require('cordova/argscheck'),
+    exec = require('cordova/exec'),
     ContactError = require('cordova/plugin/ContactError'),
     utils = require('cordova/utils');
 
@@ -1749,7 +1705,8 @@ var Contact = function (id, displayName, name, nickname, phoneNumbers, emails, a
 * @param errorCB error callback
 */
 Contact.prototype.remove = function(successCB, errorCB) {
-    var fail = function(code) {
+    argscheck.checkArgs('FF', 'Contact.remove', arguments);
+    var fail = errorCB && function(code) {
         errorCB(new ContactError(code));
     };
     if (this.id === null) {
@@ -1767,50 +1724,26 @@ Contact.prototype.remove = function(successCB, errorCB) {
 */
 Contact.prototype.clone = function() {
     var clonedContact = utils.clone(this);
-    var i;
     clonedContact.id = null;
     clonedContact.rawId = null;
+
+    function nullIds(arr) {
+        if (arr) {
+            for (var i = 0; i < arr.length; ++i) {
+                arr[i].id = null;
+            }
+        }
+    }
+
     // Loop through and clear out any id's in phones, emails, etc.
-    if (clonedContact.phoneNumbers) {
-        for (i = 0; i < clonedContact.phoneNumbers.length; i++) {
-            clonedContact.phoneNumbers[i].id = null;
-        }
-    }
-    if (clonedContact.emails) {
-        for (i = 0; i < clonedContact.emails.length; i++) {
-            clonedContact.emails[i].id = null;
-        }
-    }
-    if (clonedContact.addresses) {
-        for (i = 0; i < clonedContact.addresses.length; i++) {
-            clonedContact.addresses[i].id = null;
-        }
-    }
-    if (clonedContact.ims) {
-        for (i = 0; i < clonedContact.ims.length; i++) {
-            clonedContact.ims[i].id = null;
-        }
-    }
-    if (clonedContact.organizations) {
-        for (i = 0; i < clonedContact.organizations.length; i++) {
-            clonedContact.organizations[i].id = null;
-        }
-    }
-    if (clonedContact.categories) {
-        for (i = 0; i < clonedContact.categories.length; i++) {
-            clonedContact.categories[i].id = null;
-        }
-    }
-    if (clonedContact.photos) {
-        for (i = 0; i < clonedContact.photos.length; i++) {
-            clonedContact.photos[i].id = null;
-        }
-    }
-    if (clonedContact.urls) {
-        for (i = 0; i < clonedContact.urls.length; i++) {
-            clonedContact.urls[i].id = null;
-        }
-    }
+    nullIds(clonedContact.phoneNumbers);
+    nullIds(clonedContact.emails);
+    nullIds(clonedContact.addresses);
+    nullIds(clonedContact.ims);
+    nullIds(clonedContact.organizations);
+    nullIds(clonedContact.categories);
+    nullIds(clonedContact.photos);
+    nullIds(clonedContact.urls);
     return clonedContact;
 };
 
@@ -1820,21 +1753,22 @@ Contact.prototype.clone = function() {
 * @param errorCB error callback
 */
 Contact.prototype.save = function(successCB, errorCB) {
-  var fail = function(code) {
-      errorCB(new ContactError(code));
-  };
+    argscheck.checkArgs('FFO', 'Contact.save', arguments);
+    var fail = errorCB && function(code) {
+        errorCB(new ContactError(code));
+    };
     var success = function(result) {
-      if (result) {
-          if (typeof successCB === 'function') {
-              var fullContact = require('cordova/plugin/contacts').create(result);
-              successCB(convertIn(fullContact));
-          }
-      }
-      else {
-          // no Entry object returned
-          fail(ContactError.UNKNOWN_ERROR);
-      }
-  };
+        if (result) {
+            if (successCB) {
+                var fullContact = require('cordova/plugin/contacts').create(result);
+                successCB(convertIn(fullContact));
+            }
+        }
+        else {
+            // no Entry object returned
+            fail(ContactError.UNKNOWN_ERROR);
+        }
+    };
     var dupContact = convertOut(utils.clone(this));
     exec(success, fail, "Contacts", "save", [dupContact]);
 };
@@ -2055,7 +1989,8 @@ module.exports = Coordinates;
 // file: lib/common/plugin/DirectoryEntry.js
 define("cordova/plugin/DirectoryEntry", function(require, exports, module) {
 
-var utils = require('cordova/utils'),
+var argscheck = require('cordova/argscheck'),
+    utils = require('cordova/utils'),
     exec = require('cordova/exec'),
     Entry = require('cordova/plugin/Entry'),
     FileError = require('cordova/plugin/FileError'),
@@ -2071,7 +2006,7 @@ var utils = require('cordova/utils'),
  * TODO: implement this!!! {FileSystem} filesystem on which the directory resides (readonly)
  */
 var DirectoryEntry = function(name, fullPath) {
-     DirectoryEntry.__super__.constructor.apply(this, [false, true, name, fullPath]);
+     DirectoryEntry.__super__.constructor.call(this, false, true, name, fullPath);
 };
 
 utils.extend(DirectoryEntry, Entry);
@@ -2092,11 +2027,12 @@ DirectoryEntry.prototype.createReader = function() {
  * @param {Function} errorCallback is called with a FileError
  */
 DirectoryEntry.prototype.getDirectory = function(path, options, successCallback, errorCallback) {
-    var win = typeof successCallback !== 'function' ? null : function(result) {
+    argscheck.checkArgs('sOFF', 'DirectoryEntry.getDirectory', arguments);
+    var win = successCallback && function(result) {
         var entry = new DirectoryEntry(result.name, result.fullPath);
         successCallback(entry);
     };
-    var fail = typeof errorCallback !== 'function' ? null : function(code) {
+    var fail = errorCallback && function(code) {
         errorCallback(new FileError(code));
     };
     exec(win, fail, "File", "getDirectory", [this.fullPath, path, options]);
@@ -2109,7 +2045,8 @@ DirectoryEntry.prototype.getDirectory = function(path, options, successCallback,
  * @param {Function} errorCallback is called with a FileError
  */
 DirectoryEntry.prototype.removeRecursively = function(successCallback, errorCallback) {
-    var fail = typeof errorCallback !== 'function' ? null : function(code) {
+    argscheck.checkArgs('FF', 'DirectoryEntry.removeRecursively', arguments);
+    var fail = errorCallback && function(code) {
         errorCallback(new FileError(code));
     };
     exec(successCallback, fail, "File", "removeRecursively", [this.fullPath]);
@@ -2124,12 +2061,13 @@ DirectoryEntry.prototype.removeRecursively = function(successCallback, errorCall
  * @param {Function} errorCallback is called with a FileError
  */
 DirectoryEntry.prototype.getFile = function(path, options, successCallback, errorCallback) {
-    var win = typeof successCallback !== 'function' ? null : function(result) {
+    argscheck.checkArgs('sOFF', 'DirectoryEntry.getFile', arguments);
+    var win = successCallback && function(result) {
         var FileEntry = require('cordova/plugin/FileEntry');
         var entry = new FileEntry(result.name, result.fullPath);
         successCallback(entry);
     };
-    var fail = typeof errorCallback !== 'function' ? null : function(code) {
+    var fail = errorCallback && function(code) {
         errorCallback(new FileError(code));
     };
     exec(win, fail, "File", "getFile", [this.fullPath, path, options]);
@@ -2190,7 +2128,8 @@ module.exports = DirectoryReader;
 // file: lib/common/plugin/Entry.js
 define("cordova/plugin/Entry", function(require, exports, module) {
 
-var exec = require('cordova/exec'),
+var argscheck = require('cordova/argscheck'),
+    exec = require('cordova/exec'),
     FileError = require('cordova/plugin/FileError'),
     Metadata = require('cordova/plugin/Metadata');
 
@@ -2209,8 +2148,8 @@ var exec = require('cordova/exec'),
  *            (readonly)
  */
 function Entry(isFile, isDirectory, name, fullPath, fileSystem) {
-    this.isFile = (typeof isFile != 'undefined'?isFile:false);
-    this.isDirectory = (typeof isDirectory != 'undefined'?isDirectory:false);
+    this.isFile = !!isFile;
+    this.isDirectory = !!isDirectory;
     this.name = name || '';
     this.fullPath = fullPath || '';
     this.filesystem = fileSystem || null;
@@ -2225,15 +2164,16 @@ function Entry(isFile, isDirectory, name, fullPath, fileSystem) {
  *            {Function} is called with a FileError
  */
 Entry.prototype.getMetadata = function(successCallback, errorCallback) {
-  var success = typeof successCallback !== 'function' ? null : function(lastModified) {
-      var metadata = new Metadata(lastModified);
-      successCallback(metadata);
-  };
-  var fail = typeof errorCallback !== 'function' ? null : function(code) {
-      errorCallback(new FileError(code));
-  };
+    argscheck.checkArgs('FF', 'Entry.getMetadata', arguments);
+    var success = successCallback && function(lastModified) {
+        var metadata = new Metadata(lastModified);
+        successCallback(metadata);
+    };
+    var fail = errorCallback && function(code) {
+        errorCallback(new FileError(code));
+    };
 
-  exec(success, fail, "File", "getMetadata", [this.fullPath]);
+    exec(success, fail, "File", "getMetadata", [this.fullPath]);
 };
 
 /**
@@ -2247,8 +2187,8 @@ Entry.prototype.getMetadata = function(successCallback, errorCallback) {
  *            {Object} keys and values to set
  */
 Entry.prototype.setMetadata = function(successCallback, errorCallback, metadataObject) {
-
-  exec(successCallback, errorCallback, "File", "setMetadata", [this.fullPath, metadataObject]);
+    argscheck.checkArgs('FFO', 'Entry.setMetadata', arguments);
+    exec(successCallback, errorCallback, "File", "setMetadata", [this.fullPath, metadataObject]);
 };
 
 /**
@@ -2264,36 +2204,25 @@ Entry.prototype.setMetadata = function(successCallback, errorCallback, metadataO
  *            {Function} called with a FileError
  */
 Entry.prototype.moveTo = function(parent, newName, successCallback, errorCallback) {
-    var fail = function(code) {
-        if (typeof errorCallback === 'function') {
-            errorCallback(new FileError(code));
-        }
+    argscheck.checkArgs('oSFF', 'Entry.moveTo', arguments);
+    var fail = errorCallback && function(code) {
+        errorCallback(new FileError(code));
     };
-    // user must specify parent Entry
-    if (!parent) {
-        fail(FileError.NOT_FOUND_ERR);
-        return;
-    }
     // source path
     var srcPath = this.fullPath,
         // entry name
         name = newName || this.name,
         success = function(entry) {
             if (entry) {
-                if (typeof successCallback === 'function') {
+                if (successCallback) {
                     // create appropriate Entry object
                     var result = (entry.isDirectory) ? new (require('cordova/plugin/DirectoryEntry'))(entry.name, entry.fullPath) : new (require('cordova/plugin/FileEntry'))(entry.name, entry.fullPath);
-                    try {
-                        successCallback(result);
-                    }
-                    catch (e) {
-                        console.log('Error invoking callback: ' + e);
-                    }
+                    successCallback(result);
                 }
             }
             else {
                 // no Entry object returned
-                fail(FileError.NOT_FOUND_ERR);
+                fail && fail(FileError.NOT_FOUND_ERR);
             }
         };
 
@@ -2314,18 +2243,11 @@ Entry.prototype.moveTo = function(parent, newName, successCallback, errorCallbac
  *            {Function} called with a FileError
  */
 Entry.prototype.copyTo = function(parent, newName, successCallback, errorCallback) {
-    var fail = function(code) {
-        if (typeof errorCallback === 'function') {
-            errorCallback(new FileError(code));
-        }
+    argscheck.checkArgs('oSFF', 'Entry.copyTo', arguments);
+    var fail = errorCallback && function(code) {
+        errorCallback(new FileError(code));
     };
 
-    // user must specify parent Entry
-    if (!parent) {
-        fail(FileError.NOT_FOUND_ERR);
-        return;
-    }
-
         // source path
     var srcPath = this.fullPath,
         // entry name
@@ -2333,20 +2255,15 @@ Entry.prototype.copyTo = function(parent, newName, successCallback, errorCallbac
         // success callback
         success = function(entry) {
             if (entry) {
-                if (typeof successCallback === 'function') {
+                if (successCallback) {
                     // create appropriate Entry object
                     var result = (entry.isDirectory) ? new (require('cordova/plugin/DirectoryEntry'))(entry.name, entry.fullPath) : new (require('cordova/plugin/FileEntry'))(entry.name, entry.fullPath);
-                    try {
-                        successCallback(result);
-                    }
-                    catch (e) {
-                        console.log('Error invoking callback: ' + e);
-                    }
+                    successCallback(result);
                 }
             }
             else {
                 // no Entry object returned
-                fail(FileError.NOT_FOUND_ERR);
+                fail && fail(FileError.NOT_FOUND_ERR);
             }
         };
 
@@ -2383,7 +2300,8 @@ Entry.prototype.toURI = function(mimeType) {
  * @param errorCallback {Function} called with a FileError
  */
 Entry.prototype.remove = function(successCallback, errorCallback) {
-    var fail = typeof errorCallback !== 'function' ? null : function(code) {
+    argscheck.checkArgs('FF', 'Entry.remove', arguments);
+    var fail = errorCallback && function(code) {
         errorCallback(new FileError(code));
     };
     exec(successCallback, fail, "File", "remove", [this.fullPath]);
@@ -2396,12 +2314,13 @@ Entry.prototype.remove = function(successCallback, errorCallback) {
  * @param errorCallback {Function} called with a FileError
  */
 Entry.prototype.getParent = function(successCallback, errorCallback) {
-    var win = typeof successCallback !== 'function' ? null : function(result) {
+    argscheck.checkArgs('FF', 'Entry.getParent', arguments);
+    var win = successCallback && function(result) {
         var DirectoryEntry = require('cordova/plugin/DirectoryEntry');
         var entry = new DirectoryEntry(result.name, result.fullPath);
         successCallback(entry);
     };
-    var fail = typeof errorCallback !== 'function' ? null : function(code) {
+    var fail = errorCallback && function(code) {
         errorCallback(new FileError(code));
     };
     exec(win, fail, "File", "getParent", [this.fullPath]);
@@ -2429,8 +2348,46 @@ var File = function(name, fullPath, type, lastModifiedDate, size){
     this.type = type || null;
     this.lastModifiedDate = lastModifiedDate || null;
     this.size = size || 0;
+
+    // These store the absolute start and end for slicing the file.
+    this.start = 0;
+    this.end = this.size;
 };
 
+/**
+ * Returns a "slice" of the file. Since Cordova Files don't contain the actual
+ * content, this really returns a File with adjusted start and end.
+ * Slices of slices are supported.
+ * start {Number} The index at which to start the slice (inclusive).
+ * end {Number} The index at which to end the slice (exclusive).
+ */
+File.prototype.slice = function(start, end) {
+    var size = this.end - this.start;
+    var newStart = 0;
+    var newEnd = size;
+    if (arguments.length) {
+        if (start < 0) {
+            newStart = Math.max(size + start, 0);
+        } else {
+            newStart = Math.min(size, start);
+        }
+    }
+
+    if (arguments.length >= 2) {
+        if (end < 0) {
+            newEnd = Math.max(size + end, 0);
+        } else {
+            newEnd = Math.min(end, size);
+        }
+    }
+
+    var newFile = new File(this.name, this.fullPath, this.type, this.lastModifiedData, this.size);
+    newFile.start = this.start + newStart;
+    newFile.end = this.start + newEnd;
+    return newFile;
+};
+
+
 module.exports = File;
 
 });
@@ -2471,13 +2428,9 @@ FileEntry.prototype.createWriter = function(successCallback, errorCallback) {
         var writer = new FileWriter(filePointer);
 
         if (writer.fileName === null || writer.fileName === "") {
-            if (typeof errorCallback === "function") {
-                errorCallback(new FileError(FileError.INVALID_STATE_ERR));
-            }
+            errorCallback && errorCallback(new FileError(FileError.INVALID_STATE_ERR));
         } else {
-            if (typeof successCallback === "function") {
-                successCallback(writer);
-            }
+            successCallback && successCallback(writer);
         }
     }, errorCallback);
 };
@@ -2489,11 +2442,11 @@ FileEntry.prototype.createWriter = function(successCallback, errorCallback) {
  * @param {Function} errorCallback is called with a FileError
  */
 FileEntry.prototype.file = function(successCallback, errorCallback) {
-    var win = typeof successCallback !== 'function' ? null : function(f) {
+    var win = successCallback && function(f) {
         var file = new File(f.name, f.fullPath, f.type, f.lastModifiedDate, f.size);
         successCallback(file);
     };
-    var fail = typeof errorCallback !== 'function' ? null : function(code) {
+    var fail = errorCallback && function(code) {
         errorCallback(new FileError(code));
     };
     exec(win, fail, "File", "getFileMetadata", [this.fullPath]);
@@ -2539,8 +2492,11 @@ module.exports = FileError;
 define("cordova/plugin/FileReader", function(require, exports, module) {
 
 var exec = require('cordova/exec'),
+    utils = require('cordova/utils'),
+    File = require('cordova/plugin/File'),
     FileError = require('cordova/plugin/FileError'),
-    ProgressEvent = require('cordova/plugin/ProgressEvent');
+    ProgressEvent = require('cordova/plugin/ProgressEvent'),
+    origFileReader = this.FileReader;
 
 /**
  * This class reads the mobile device file system.
@@ -2551,23 +2507,11 @@ var exec = require('cordova/exec'),
  * @constructor
  */
 var FileReader = function() {
-    this.fileName = "";
-
-    this.readyState = 0; // FileReader.EMPTY
-
-    // File data
-    this.result = null;
-
-    // Error
-    this.error = null;
-
-    // Event handlers
-    this.onloadstart = null;    // When the read starts.
-    this.onprogress = null;     // While reading (and decoding) file or fileBlob data, and reporting partial file data (progress.loaded/progress.total)
-    this.onload = null;         // When the read has successfully completed.
-    this.onerror = null;        // When the read has failed (see errors).
-    this.onloadend = null;      // When the request has completed (either in success or failure).
-    this.onabort = null;        // When the read has been aborted. For instance, by invoking the abort() method.
+    this._readyState = 0;
+    this._error = null;
+    this._result = null;
+    this._fileName = '';
+    this._realReader = origFileReader ? new origFileReader() : {};
 };
 
 // States
@@ -2575,17 +2519,70 @@ FileReader.EMPTY = 0;
 FileReader.LOADING = 1;
 FileReader.DONE = 2;
 
+utils.defineGetter(FileReader.prototype, 'readyState', function() {
+    return this._fileName ? this._readyState : this._realReader.readyState;
+});
+
+utils.defineGetter(FileReader.prototype, 'error', function() {
+    return this._fileName ? this._error: this._realReader.error;
+});
+
+utils.defineGetter(FileReader.prototype, 'result', function() {
+    return this._fileName ? this._result: this._realReader.result;
+});
+
+function defineEvent(eventName) {
+    utils.defineGetterSetter(FileReader.prototype, eventName, function() {
+        return this._realReader[eventName] || null;
+    }, function(value) {
+        this._realReader[eventName] = value;
+    });
+}
+defineEvent('onloadstart');    // When the read starts.
+defineEvent('onprogress');     // While reading (and decoding) file or fileBlob data, and reporting partial file data (progress.loaded/progress.total)
+defineEvent('onload');         // When the read has successfully completed.
+defineEvent('onerror');        // When the read has failed (see errors).
+defineEvent('onloadend');      // When the request has completed (either in success or failure).
+defineEvent('onabort');        // When the read has been aborted. For instance, by invoking the abort() method.
+
+function initRead(reader, file) {
+    // Already loading something
+    if (reader.readyState == FileReader.LOADING) {
+      throw new FileError(FileError.INVALID_STATE_ERR);
+    }
+
+    reader._result = null;
+    reader._error = null;
+    reader._readyState = FileReader.LOADING;
+
+    if (typeof file == 'string') {
+        // Deprecated in Cordova 2.4.
+        console.warning('Using a string argument with FileReader.readAs functions is deprecated.');
+        reader._fileName = file;
+    } else if (typeof file.fullPath == 'string') {
+        reader._fileName = file.fullPath;
+    } else {
+        reader._fileName = '';
+        return true;
+    }
+
+    reader.onloadstart && reader.onloadstart(new ProgressEvent("loadstart", {target:reader}));
+}
+
 /**
  * Abort reading file.
  */
 FileReader.prototype.abort = function() {
-    this.result = null;
+    if (origFileReader && !this._fileName) {
+        return this._realReader.abort();
+    }
+    this._result = null;
 
-    if (this.readyState == FileReader.DONE || this.readyState == FileReader.EMPTY) {
+    if (this._readyState == FileReader.DONE || this._readyState == FileReader.EMPTY) {
       return;
     }
 
-    this.readyState = FileReader.DONE;
+    this._readyState = FileReader.DONE;
 
     // If abort callback
     if (typeof this.onabort === 'function') {
@@ -2604,43 +2601,33 @@ FileReader.prototype.abort = function() {
  * @param encoding      [Optional] (see http://www.iana.org/assignments/character-sets)
  */
 FileReader.prototype.readAsText = function(file, encoding) {
-    // Figure out pathing
-    this.fileName = '';
-    if (typeof file.fullPath === 'undefined') {
-        this.fileName = file;
-    } else {
-        this.fileName = file.fullPath;
-    }
-
-    // Already loading something
-    if (this.readyState == FileReader.LOADING) {
-        throw new FileError(FileError.INVALID_STATE_ERR);
-    }
-
-    // LOADING state
-    this.readyState = FileReader.LOADING;
-
-    // If loadstart callback
-    if (typeof this.onloadstart === "function") {
-        this.onloadstart(new ProgressEvent("loadstart", {target:this}));
+    if (initRead(this, file)) {
+        return this._realReader.readAsText(file, encoding);
     }
 
     // Default encoding is UTF-8
     var enc = encoding ? encoding : "UTF-8";
-
     var me = this;
+    var execArgs = [this._fileName, enc];
+
+    // Maybe add slice parameters.
+    if (file.end < file.size) {
+        execArgs.push(file.start, file.end);
+    } else if (file.start > 0) {
+        execArgs.push(file.start);
+    }
 
     // Read file
     exec(
         // Success callback
         function(r) {
             // If DONE (cancelled), then don't do anything
-            if (me.readyState === FileReader.DONE) {
+            if (me._readyState === FileReader.DONE) {
                 return;
             }
 
             // Save result
-            me.result = r;
+            me._result = r;
 
             // If onload callback
             if (typeof me.onload === "function") {
@@ -2648,7 +2635,7 @@ FileReader.prototype.readAsText = function(file, encoding) {
             }
 
             // DONE state
-            me.readyState = FileReader.DONE;
+            me._readyState = FileReader.DONE;
 
             // If onloadend callback
             if (typeof me.onloadend === "function") {
@@ -2658,18 +2645,18 @@ FileReader.prototype.readAsText = function(file, encoding) {
         // Error callback
         function(e) {
             // If DONE (cancelled), then don't do anything
-            if (me.readyState === FileReader.DONE) {
+            if (me._readyState === FileReader.DONE) {
                 return;
             }
 
             // DONE state
-            me.readyState = FileReader.DONE;
+            me._readyState = FileReader.DONE;
 
             // null result
-            me.result = null;
+            me._result = null;
 
             // Save error
-            me.error = new FileError(e);
+            me._error = new FileError(e);
 
             // If onerror callback
             if (typeof me.onerror === "function") {
@@ -2680,7 +2667,7 @@ FileReader.prototype.readAsText = function(file, encoding) {
             if (typeof me.onloadend === "function") {
                 me.onloadend(new ProgressEvent("loadend", {target:me}));
             }
-        }, "File", "readAsText", [this.fileName, enc]);
+        }, "File", "readAsText", execArgs);
 };
 
 
@@ -2692,42 +2679,34 @@ FileReader.prototype.readAsText = function(file, encoding) {
  * @param file          {File} File object containing file properties
  */
 FileReader.prototype.readAsDataURL = function(file) {
-    this.fileName = "";
-    if (typeof file.fullPath === "undefined") {
-        this.fileName = file;
-    } else {
-        this.fileName = file.fullPath;
-    }
-
-    // Already loading something
-    if (this.readyState == FileReader.LOADING) {
-        throw new FileError(FileError.INVALID_STATE_ERR);
-    }
-
-    // LOADING state
-    this.readyState = FileReader.LOADING;
-
-    // If loadstart callback
-    if (typeof this.onloadstart === "function") {
-        this.onloadstart(new ProgressEvent("loadstart", {target:this}));
+    if (initRead(this, file)) {
+        return this._realReader.readAsDataURL(file);
     }
 
     var me = this;
+    var execArgs = [this._fileName];
+
+    // Maybe add slice parameters.
+    if (file.end < file.size) {
+        execArgs.push(file.start, file.end);
+    } else if (file.start > 0) {
+        execArgs.push(file.start);
+    }
 
     // Read file
     exec(
         // Success callback
         function(r) {
             // If DONE (cancelled), then don't do anything
-            if (me.readyState === FileReader.DONE) {
+            if (me._readyState === FileReader.DONE) {
                 return;
             }
 
             // DONE state
-            me.readyState = FileReader.DONE;
+            me._readyState = FileReader.DONE;
 
             // Save result
-            me.result = r;
+            me._result = r;
 
             // If onload callback
             if (typeof me.onload === "function") {
@@ -2742,17 +2721,17 @@ FileReader.prototype.readAsDataURL = function(file) {
         // Error callback
         function(e) {
             // If DONE (cancelled), then don't do anything
-            if (me.readyState === FileReader.DONE) {
+            if (me._readyState === FileReader.DONE) {
                 return;
             }
 
             // DONE state
-            me.readyState = FileReader.DONE;
+            me._readyState = FileReader.DONE;
 
-            me.result = null;
+            me._result = null;
 
             // Save error
-            me.error = new FileError(e);
+            me._error = new FileError(e);
 
             // If onerror callback
             if (typeof me.onerror === "function") {
@@ -2763,7 +2742,7 @@ FileReader.prototype.readAsDataURL = function(file) {
             if (typeof me.onloadend === "function") {
                 me.onloadend(new ProgressEvent("loadend", {target:me}));
             }
-        }, "File", "readAsDataURL", [this.fileName]);
+        }, "File", "readAsDataURL", execArgs);
 };
 
 /**
@@ -2772,8 +2751,12 @@ FileReader.prototype.readAsDataURL = function(file) {
  * @param file          {File} File object containing file properties
  */
 FileReader.prototype.readAsBinaryString = function(file) {
+    if (initRead(this, file)) {
+        return this._realReader.readAsBinaryString(file);
+    }
     // TODO - Can't return binary data to browser.
     console.log('method "readAsBinaryString" is not supported at this time.');
+    this.abort();
 };
 
 /**
@@ -2782,8 +2765,12 @@ FileReader.prototype.readAsBinaryString = function(file) {
  * @param file          {File} File object containing file properties
  */
 FileReader.prototype.readAsArrayBuffer = function(file) {
+    if (initRead(this, file)) {
+        return this._realReader.readAsArrayBuffer(file);
+    }
     // TODO - Can't return binary data to browser.
     console.log('This method is not supported at this time.');
+    this.abort();
 };
 
 module.exports = FileReader;
@@ -2816,7 +2803,8 @@ module.exports = FileSystem;
 // file: lib/common/plugin/FileTransfer.js
 define("cordova/plugin/FileTransfer", function(require, exports, module) {
 
-var exec = require('cordova/exec'),
+var argscheck = require('cordova/argscheck'),
+    exec = require('cordova/exec'),
     FileTransferError = require('cordova/plugin/FileTransferError'),
     ProgressEvent = require('cordova/plugin/ProgressEvent');
 
@@ -2850,8 +2838,7 @@ var FileTransfer = function() {
 * @param trustAllHosts {Boolean} Optional trust all hosts (e.g. for self-signed certs), defaults to false
 */
 FileTransfer.prototype.upload = function(filePath, server, successCallback, errorCallback, options, trustAllHosts) {
-    // sanity parameter checking
-    if (!filePath || !server) throw new Error("FileTransfer.upload requires filePath and server URL parameters at the minimum.");
+    argscheck.checkArgs('ssFFO*', 'FileTransfer.upload', arguments);
     // check for options
     var fileKey = null;
     var fileName = null;
@@ -2875,7 +2862,7 @@ FileTransfer.prototype.upload = function(filePath, server, successCallback, erro
         }
     }
 
-    var fail = function(e) {
+    var fail = errorCallback && function(e) {
         var error = new FileTransferError(e.code, e.source, e.target, e.http_status);
         errorCallback(error);
     };
@@ -2884,10 +2871,10 @@ FileTransfer.prototype.upload = function(filePath, server, successCallback, erro
     var win = function(result) {
         if (typeof result.lengthComputable != "undefined") {
             if (self.onprogress) {
-                return self.onprogress(newProgressEvent(result));
+                self.onprogress(newProgressEvent(result));
             }
         } else {
-            return successCallback(result);
+            successCallback && successCallback(result);
         }
     };
     exec(win, fail, 'FileTransfer', 'upload', [filePath, server, fileKey, fileName, mimeType, params, trustAllHosts, chunkedMode, headers, this._id]);
@@ -2902,15 +2889,14 @@ FileTransfer.prototype.upload = function(filePath, server, successCallback, erro
  * @param trustAllHosts {Boolean} Optional trust all hosts (e.g. for self-signed certs), defaults to false
  */
 FileTransfer.prototype.download = function(source, target, successCallback, errorCallback, trustAllHosts) {
-    // sanity parameter checking
-    if (!source || !target) throw new Error("FileTransfer.download requires source URI and target URI parameters at the minimum.");
+    argscheck.checkArgs('ssFF*', 'FileTransfer.download', arguments);
     var self = this;
     var win = function(result) {
         if (typeof result.lengthComputable != "undefined") {
             if (self.onprogress) {
                 return self.onprogress(newProgressEvent(result));
             }
-        } else {
+        } else if (successCallback) {
             var entry = null;
             if (result.isDirectory) {
                 entry = new (require('cordova/plugin/DirectoryEntry'))();
@@ -2926,7 +2912,7 @@ FileTransfer.prototype.download = function(source, target, successCallback, erro
         }
     };
 
-    var fail = function(e) {
+    var fail = errorCallback && function(e) {
         var error = new FileTransferError(e.code, e.source, e.target, e.http_status);
         errorCallback(error);
     };
@@ -3322,55 +3308,48 @@ module.exports = GlobalizationError;
 define("cordova/plugin/InAppBrowser", function(require, exports, module) {
 
 var exec = require('cordova/exec');
+var channel = require('cordova/channel');
 
-function InAppBrowser()
-{
-   var _channel = require('cordova/channel');
+function InAppBrowser() {
    this.channels = {
-        'loadstart': _channel.create('loadstart'),
-        'loadstop' : _channel.create('loadstop'),
-        'exit' : _channel.create('exit')
+        'loadstart': channel.create('loadstart'),
+        'loadstop' : channel.create('loadstop'),
+        'exit' : channel.create('exit')
    };
 }
 
-InAppBrowser.prototype._eventHandler = function(event)
-{
-    if (event.type in this.channels) {
-        this.channels[event.type].fire(event);
+InAppBrowser.prototype = {
+    _eventHandler: function (event) {
+        if (event.type in this.channels) {
+            this.channels[event.type].fire(event);
+        }
+    },
+    close: function (eventname) {
+        exec(null, null, "InAppBrowser", "close", []);
+    },
+    addEventListener: function (eventname,f) {
+        if (eventname in this.channels) {
+            this.channels[eventname].subscribe(f);
+        }
+    },
+    removeEventListener: function(eventname, f) {
+        if (eventname in this.channels) {
+            this.channels[eventname].unsubscribe(f);
+        }
     }
-}
+};
 
-InAppBrowser.open = function(strUrl, strWindowName, strWindowFeatures)
-{
+module.exports = function(strUrl, strWindowName, strWindowFeatures) {
     var iab = new InAppBrowser();
     var cb = function(eventname) {
        iab._eventHandler(eventname);
-    }
+    };
     exec(cb, null, "InAppBrowser", "open", [strUrl, strWindowName, strWindowFeatures]);
     return iab;
-}
-
-InAppBrowser.prototype.close = function(eventname, f)
-{
-    exec(null, null, "InAppBrowser", "close", []);
-}
-
-InAppBrowser.prototype.addEventListener = function(eventname, f)
-{
-    if (eventname in this.channels) {
-        this.channels[eventname].subscribe(f);
-    }
-}
-
-InAppBrowser.prototype.removeEventListener = function(eventname, f)
-{
-    if (eventname in this.channels) {
-        this.channels[eventname].unsubscribe(f);
-    }
-}
-
-module.exports = InAppBrowser.open;
+};
 
+//Export the original open so it can be used if needed
+module.exports._orig = window.open;
 
 });
 
@@ -3396,7 +3375,8 @@ module.exports = LocalFileSystem;
 // file: lib/common/plugin/Media.js
 define("cordova/plugin/Media", function(require, exports, module) {
 
-var utils = require('cordova/utils'),
+var argscheck = require('cordova/argscheck'),
+    utils = require('cordova/utils'),
     exec = require('cordova/exec');
 
 var mediaObjects = {};
@@ -3414,25 +3394,7 @@ var mediaObjects = {};
  *                                  statusCallback(int statusCode) - OPTIONAL
  */
 var Media = function(src, successCallback, errorCallback, statusCallback) {
-
-    // successCallback optional
-    if (successCallback && (typeof successCallback !== "function")) {
-        console.log("Media Error: successCallback is not a function");
-        return;
-    }
-
-    // errorCallback optional
-    if (errorCallback && (typeof errorCallback !== "function")) {
-        console.log("Media Error: errorCallback is not a function");
-        return;
-    }
-
-    // statusCallback optional
-    if (statusCallback && (typeof statusCallback !== "function")) {
-        console.log("Media Error: statusCallback is not a function");
-        return;
-    }
-
+    argscheck.checkArgs('SFFF', 'Media', arguments);
     this.id = utils.createUUID();
     mediaObjects[this.id] = this;
     this.src = src;
@@ -3576,12 +3538,12 @@ Media.onStatus = function(id, msgType, value) {
                 media._position = Number(value);
                 break;
             default :
-                console && console.error && console.error("Unhandled Media.onStatus :: " + msgType);
+                console.error && console.error("Unhandled Media.onStatus :: " + msgType);
                 break;
         }
     }
     else {
-         console && console.error && console.error("Received Media.onStatus callback for unknown media :: " + id);
+         console.error && console.error("Received Media.onStatus callback for unknown media :: " + id);
     }
 
 };
@@ -5113,6 +5075,9 @@ var exec = require('cordova/exec');
  */
 module.exports = function(successCallback, errorCallback, message, forceAsync) {
     var action = forceAsync ? 'echoAsync' : 'echo';
+    if (!forceAsync && message.constructor == ArrayBuffer) {
+        action = 'echoArrayBuffer';
+    }
     exec(successCallback, errorCallback, "Echo", action, [message]);
 };
 
@@ -6172,16 +6137,28 @@ define("cordova/utils", function(require, exports, module) {
 var utils = exports;
 
 /**
- * Defines a property getter for obj[key].
+ * Defines a property getter / setter for obj[key].
  */
-utils.defineGetter = function(obj, key, func) {
+utils.defineGetterSetter = function(obj, key, getFunc, opt_setFunc) {
     if (Object.defineProperty) {
-        Object.defineProperty(obj, key, { get: func });
+        var desc = {get:getFunc};
+        if (opt_setFunc) {
+            desc.set = opt_setFunc;
+        }
+        Object.defineProperty(obj, key, desc);
     } else {
-        obj.__defineGetter__(key, func);
+        obj.__defineGetter__(key, getFunc);
+        if (opt_setFunc) {
+            obj.__defineSetter__(key, opt_setFunc);
+        }
     }
 };
 
+/**
+ * Defines a property getter for obj[key].
+ */
+utils.defineGetter = utils.defineGetterSetter;
+
 utils.arrayIndexOf = function(a, item) {
     if (a.indexOf) {
         return a.indexOf(item);
@@ -6206,18 +6183,22 @@ utils.arrayRemove = function(a, item) {
     return index != -1;
 };
 
+utils.typeName = function(val) {
+    return Object.prototype.toString.call(val).slice(8, -1);
+};
+
 /**
  * Returns an indication of whether the argument is an array or not
  */
 utils.isArray = function(a) {
-    return Object.prototype.toString.call(a) == '[object Array]';
+    return utils.typeName(a) == 'Array';
 };
 
 /**
  * Returns an indication of whether the argument is a Date or not
  */
 utils.isDate = function(d) {
-    return Object.prototype.toString.call(d) == '[object Date]';
+    return utils.typeName(d) == 'Date';
 };
 
 /**
@@ -6402,7 +6383,7 @@ window.cordova = require('cordova');
     // Replace navigator before any modules are required(), to ensure it happens as soon as possible.
     // We replace it so that properties that can't be clobbered can instead be overridden.
     if (context.navigator) {
-        function CordovaNavigator() {}
+        var CordovaNavigator = function() {};
         CordovaNavigator.prototype = context.navigator;
         context.navigator = new CordovaNavigator();
     }
diff --git a/framework/assets/www/index.html b/framework/assets/www/index.html
index 7c5bbd13..77db5afa 100644
--- a/framework/assets/www/index.html
+++ b/framework/assets/www/index.html
@@ -19,7 +19,7 @@
 <html>
   <head>
     <title></title>
-    <script src="cordova-2.3.0.js"></script>
+    <script src="cordova-2.4.0rc1.js"></script>
   </head>
   <body>
 
diff --git a/framework/src/org/apache/cordova/Device.java b/framework/src/org/apache/cordova/Device.java
index d9a02007..a833a1fb 100644
--- a/framework/src/org/apache/cordova/Device.java
+++ b/framework/src/org/apache/cordova/Device.java
@@ -39,7 +39,7 @@ import android.telephony.TelephonyManager;
 public class Device extends CordovaPlugin {
     public static final String TAG = "Device";
 
-    public static String cordovaVersion = "2.3.0";              // Cordova version
+    public static String cordovaVersion = "2.4.0rc1";              // Cordova version
     public static String platform = "Android";                  // Device OS
     public static String uuid;                                  // Device UUID