diff --git a/qmlexport/QskQml.cpp b/qmlexport/QskQml.cpp
index 441bf47f..dc13f94c 100644
--- a/qmlexport/QskQml.cpp
+++ b/qmlexport/QskQml.cpp
@@ -60,7 +60,6 @@ QSK_QT_PRIVATE_END
     qmlRegisterType< className >( QSK_MODULE_NAME, 1, 0, typeName );
 
 #define QSK_REGISTER_GADGET( className, typeName ) \
-    qRegisterMetaType< className >(); \
     qmlRegisterUncreatableType< className >( QSK_MODULE_NAME, 1, 0, typeName, QString() )
 
 // Required for QFlags to be constructed from an enum value
@@ -208,6 +207,7 @@ void QskQml::registerTypes()
     // Support (lists of) GradientStop
     QMetaType::registerConverter< QJSValue, QskGradientStop >( qskToGradientStop );
 
+#if 0
     QMetaType::registerConverter< QJSValue, QskGradientStops >(
 
         []( const QJSValue& value )
@@ -223,6 +223,7 @@ void QskQml::registerTypes()
             return stops;
         }
     );
+#endif
 
 #if QT_VERSION < QT_VERSION_CHECK( 6, 2, 0 )
     // how to do this with >= 6.2 TODO ...
diff --git a/src/common/QskAspect.cpp b/src/common/QskAspect.cpp
index d59ceeee..30533426 100644
--- a/src/common/QskAspect.cpp
+++ b/src/common/QskAspect.cpp
@@ -17,6 +17,17 @@
 static_assert( sizeof( QskAspect ) == sizeof( quint64 ),
     "QskAspect::Aspect has to match quint64" );
 
+static void qskRegisterAspect()
+{
+    qRegisterMetaType< QskAspect >();
+
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+    QMetaType::registerEqualsComparator< QskAspect >();
+#endif
+}
+
+Q_CONSTRUCTOR_FUNCTION( qskRegisterAspect )
+
 namespace
 {
     using namespace std;
diff --git a/src/common/QskMargins.cpp b/src/common/QskMargins.cpp
index f1e65c3f..5aa5f98e 100644
--- a/src/common/QskMargins.cpp
+++ b/src/common/QskMargins.cpp
@@ -1,16 +1,22 @@
 #include "QskMargins.h"
 #include <qvariant.h>
 
-static void qskRegisterConverter()
+static void qskRegisterMargins()
 {
+    qRegisterMetaType< QskMargins >();
+
     QMetaType::registerConverter< int, QskMargins >(
         []( int value ) { return QskMargins( value ); } );
 
     QMetaType::registerConverter< qreal, QskMargins >(
         []( qreal value ) { return QskMargins( value ); } );
+
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+    QMetaType::registerEqualsComparator< QskMargins >();
+#endif
 }
 
-Q_CONSTRUCTOR_FUNCTION( qskRegisterConverter )
+Q_CONSTRUCTOR_FUNCTION( qskRegisterMargins )
 
 static inline qreal qskInterpolated( qreal from, qreal to, qreal ratio )
 {
diff --git a/src/common/QskSizePolicy.cpp b/src/common/QskSizePolicy.cpp
index 4d4cbb92..fbae27f6 100644
--- a/src/common/QskSizePolicy.cpp
+++ b/src/common/QskSizePolicy.cpp
@@ -11,6 +11,17 @@
 
 #include <utility>
 
+static void qskRegisterSizePolicy()
+{
+    qRegisterMetaType< QskSizePolicy >();
+
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+    QMetaType::registerEqualsComparator< QskSizePolicy >();
+#endif
+}
+
+Q_CONSTRUCTOR_FUNCTION( qskRegisterSizePolicy )
+
 QskSizePolicy::ConstraintType QskSizePolicy::constraintType() const noexcept
 {
     constexpr unsigned char mask = IgnoreFlag | ConstrainedFlag;
diff --git a/src/common/QskTextOptions.cpp b/src/common/QskTextOptions.cpp
index e6801fbd..712ec150 100644
--- a/src/common/QskTextOptions.cpp
+++ b/src/common/QskTextOptions.cpp
@@ -9,6 +9,10 @@
 static void qskRegisterTextOptions()
 {
     qRegisterMetaType< QskTextOptions >();
+
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+    QMetaType::registerEqualsComparator< QskTextOptions >();
+#endif
 }
 
 Q_CONSTRUCTOR_FUNCTION( qskRegisterTextOptions )
diff --git a/src/layouts/QskLayoutMetrics.cpp b/src/layouts/QskLayoutMetrics.cpp
index 086c29a3..7d45470d 100644
--- a/src/layouts/QskLayoutMetrics.cpp
+++ b/src/layouts/QskLayoutMetrics.cpp
@@ -8,6 +8,17 @@
 #include <qnamespace.h>
 #include <algorithm>
 
+static void qskRegisterLayoutMetrics()
+{
+    qRegisterMetaType< QskLayoutMetrics >();
+
+#if QT_VERSION < QT_VERSION_CHECK( 6, 0, 0 )
+    QMetaType::registerEqualsComparator< QskLayoutMetrics >();
+#endif
+}
+
+Q_CONSTRUCTOR_FUNCTION( qskRegisterLayoutMetrics )
+
 void QskLayoutMetrics::setMetric( int which, qreal metric ) noexcept
 {
     switch (which)