Fixes #8692. Strange FF4 bug: values changed onto the arguments objec…

…t sometimes end up as undefined values outside the $.when method. Cloning the object into a fresh array solves the issue.

src/deferred.js

@@ -144,7 +144,10 @@ jQuery.extend({
			return function( value ) {
				args[ i ] = arguments.length > 1 ? sliceDeferred.call( arguments, 0 ) : value;
				if ( !( --count ) ) {
					deferred.resolveWith( deferred, args );
					// Strange bug in FF4:
					// Values changed onto the arguments object sometimes end up as undefined values
					// outside the $.when method. Cloning the object into a fresh array solves the issue
					deferred.resolveWith( deferred, sliceDeferred.call( args, 0 ) );
				}
			};
		}