diff --git a/AUTHORS.txt b/AUTHORS.txt
index 6817f2308..b39a038c7 100644
--- a/AUTHORS.txt
+++ b/AUTHORS.txt
@@ -226,7 +226,7 @@ Anika Henke <anika@selfthinker.org>
 Samuel Bovée <samycookie2000@yahoo.fr>
 Fabrício Matté <ult_combo@hotmail.com>
 Viktor Kojouharov <vkojouharov@gmail.com>
-Pawel Maruszczyk <lord_t@o2.pl>
+Pawel Maruszczyk (http://hrabstwo.net)
 Pavel Selitskas <p.selitskas@gmail.com>
 Bjørn Johansen <bjorn.johansen@metronet.no>
 Matthieu Penant <thieum22@hotmail.com>
diff --git a/tests/unit/spinner/spinner_methods.js b/tests/unit/spinner/spinner_methods.js
index 4f44a73ae..41c991be3 100644
--- a/tests/unit/spinner/spinner_methods.js
+++ b/tests/unit/spinner/spinner_methods.js
@@ -73,6 +73,38 @@ test( "enable", function() {
 	equal( 2, element.val(), "keyboard - value changes on key UP" );
 });
 
+test( "isValid", function() {
+	expect( 8 );
+	var element = $( "#spin" ).spinner({
+			min: 0,
+			max: 10,
+			step: 2
+		}),
+		spinner = element.spinner( "instance" );
+	ok( !spinner.isValid(), "initial state is invalid" );
+
+	element.val( "this is not a number" );
+	ok( !spinner.isValid(), "text string is not valid" );
+
+	element.val( "0" );
+	ok( spinner.isValid(), "min value is valid" );
+
+	element.val( "10" );
+	ok( spinner.isValid(), "max value is valid" );
+
+	element.val( "4" );
+	ok( spinner.isValid(), "inbetween step is valid" );
+
+	element.val( "-1" );
+	ok( !spinner.isValid(), "below min is invalid" );
+
+	element.val( "11" );
+	ok( !spinner.isValid(), "above max is invalid" );
+
+	element.val( "1" );
+	ok( !spinner.isValid(), "step mismatch is invalid" );
+});
+
 test( "pageDown", function() {
 	expect( 4 );
 	var element = $( "#spin" ).val( -12 ).spinner({
diff --git a/tests/unit/widget/widget_core.js b/tests/unit/widget/widget_core.js
index 3db79ec06..ec4c85874 100644
--- a/tests/unit/widget/widget_core.js
+++ b/tests/unit/widget/widget_core.js
@@ -1409,7 +1409,7 @@ asyncTest( "_delay", function() {
 });
 
 test( "$.widget.bridge()", function() {
-	expect( 10 );
+	expect( 14 );
 
 	var instance, ret,
 		elem = $( "<div>" );
@@ -1427,6 +1427,9 @@ test( "$.widget.bridge()", function() {
 		},
 		getter: function() {
 			return "qux";
+		},
+		option: function( options ) {
+			deepEqual( options, {} );
 		}
 	});
 
@@ -1444,6 +1447,14 @@ test( "$.widget.bridge()", function() {
 
 	ret = elem.testWidget( "getter" );
 	equal( ret, "qux", "getter returns value" );
+
+	elem.testWidget();
+	ok( true, "_init is optional" );
+
+	TestWidget.prototype._init = function() {
+		ok( "_init", "_init now exists, so its called" );
+	};
+	elem.testWidget();
 });
 
 test( "$.widget.bridge() - widgetFullName", function() {
diff --git a/ui/jquery.ui.spinner.js b/ui/jquery.ui.spinner.js
index c022413dc..a4912fc7e 100644
--- a/ui/jquery.ui.spinner.js
+++ b/ui/jquery.ui.spinner.js
@@ -418,6 +418,18 @@ $.widget( "ui.spinner", {
 		});
 	},
 
+	isValid: function() {
+		var value = this.value();
+
+		// null is invalid
+		if ( value === null ) {
+			return false;
+		}
+
+		// if value gets adjusted, it's invalid
+		return value === this._adjustValue( value );
+	},
+
 	// update the value without triggering change
 	_value: function( value, allowAny ) {
 		var parsed;
diff --git a/ui/jquery.ui.widget.js b/ui/jquery.ui.widget.js
index 885e2019f..a46dcaf99 100644
--- a/ui/jquery.ui.widget.js
+++ b/ui/jquery.ui.widget.js
@@ -203,7 +203,10 @@ $.widget.bridge = function( name, object ) {
 			this.each(function() {
 				var instance = $.data( this, fullName );
 				if ( instance ) {
-					instance.option( options || {} )._init();
+					instance.option( options || {} );
+					if ( instance._init ) {
+						instance._init();
+					}
 				} else {
 					$.data( this, fullName, new object( options, this ) );
 				}
@@ -349,8 +352,12 @@ $.Widget.prototype = {
 		if ( key === "disabled" ) {
 			this.widget()
 				.toggleClass( this.widgetFullName + "-disabled", !!value );
-			this.hoverable.removeClass( "ui-state-hover" );
-			this.focusable.removeClass( "ui-state-focus" );
+
+			// If the widget is becoming disabled, then nothing is interactive
+			if ( value ) {
+				this.hoverable.removeClass( "ui-state-hover" );
+				this.focusable.removeClass( "ui-state-focus" );
+			}
 		}
 
 		return this;