diff --git a/src/common/QskAspect.h b/src/common/QskAspect.h
index 87164eee..94b45452 100644
--- a/src/common/QskAspect.h
+++ b/src/common/QskAspect.h
@@ -179,19 +179,26 @@ namespace QskAspect
         constexpr Aspect( uint subControl, uint type, bool isAnimator,
             uint primitive, uint placement, uint states );
 
-        uint m_subControl : 12;
+        union
+        {
+            struct
+            {
+                uint m_subControl : 12;
 
-        uint m_type : 3;
-        bool m_isAnimator : 1;
+                uint m_type : 3;
+                bool m_isAnimator : 1;
 
-        uint m_primitive : 7;
-        uint m_placement : 1;
-        uint m_reserved1 : 8;
+                uint m_primitive : 7;
+                uint m_placement : 1;
+                uint m_reserved1 : 8;
 
-        uint m_states : 16;
-        uint m_reserved2 : 16;
+                uint m_states : 16;
+                uint m_reserved2 : 16;
+            };
 
-    } Q_PACKED;
+            quint64 m_value;
+        };
+    };
 
     inline constexpr Aspect::Aspect():
         Aspect( Control, Flag, Preserved )
@@ -233,17 +240,17 @@ namespace QskAspect
 
     inline bool Aspect::operator==( const Aspect& other ) const
     {
-        return value() == other.value();
+        return m_value == other.m_value;
     }
 
     inline bool Aspect::operator!=( const Aspect& other ) const
     {
-        return value() != other.value();
+        return m_value != other.m_value;
     }
 
     inline bool Aspect::operator<( const Aspect& other ) const
     {
-        return value() < other.value();
+        return m_value < other.m_value;
     }
 
     inline constexpr Aspect Aspect::operator|( Subcontrol subControl ) const
@@ -288,7 +295,7 @@ namespace QskAspect
 
     inline constexpr quint64 Aspect::value() const
     {
-        return *( const quint64* ) this;
+        return m_value;
     }
 
     inline bool Aspect::isAnimator() const
@@ -426,7 +433,7 @@ namespace QskAspect
         return Aspect( subControl ) | state;
     }
 
-   inline constexpr Aspect operator|( Type type, Placement placement )
+    inline constexpr Aspect operator|( Type type, Placement placement )
     {
         return Aspect( type ) | placement;
     }
diff --git a/src/controls/QskControl.cpp b/src/controls/QskControl.cpp
index d5e7ca5a..ce106c95 100644
--- a/src/controls/QskControl.cpp
+++ b/src/controls/QskControl.cpp
@@ -561,9 +561,12 @@ void QskControl::updateControlFlags( Flags flags )
 
     if ( oldFlags != newFlags )
     {
-        for ( uint i = 0; i <= LastFlag; ++i )
+        const auto numBits = qCountTrailingZeroBits(
+            static_cast< quint32 >( LastFlag ) );
+
+        for ( quint32 i = 0; i <= numBits; ++i )
         {
-            const uint flag = ( 1 << i );
+            const quint32 flag = ( 1 << i );
             updateControlFlag( flag, flags & flag );
         }
 
diff --git a/src/controls/QskVariantAnimator.cpp b/src/controls/QskVariantAnimator.cpp
index 3edfd680..934fd3ec 100644
--- a/src/controls/QskVariantAnimator.cpp
+++ b/src/controls/QskVariantAnimator.cpp
@@ -33,9 +33,22 @@ static void qskRegisterInterpolator()
 Q_CONSTRUCTOR_FUNCTION( qskRegisterInterpolator )
 #endif
 
-static inline QVariant qskInterpolate( void( *interpolator )(),
-    const QVariant& from, const QVariant& to, qreal progress )
+#if defined(Q_CC_CLANG) 
+#if __has_feature(address_sanitizer)
+#define QSK_DECL_INSANE __attribute__ ( ( no_sanitize ("undefined") ) )
+#endif
+#endif
+
+QSK_DECL_INSANE static inline QVariant qskInterpolate (
+    void( *interpolator )(), const QVariant& from, const QVariant& to, qreal progress )
 {
+#if 1
+    /*
+        how to get rid of the reported runtime error from the clang sanitizer,
+        when calling F( const T&, ... ) as G( const void* ... ); TODO ...
+     */
+#endif
+
     auto f = reinterpret_cast< QVariantAnimation::Interpolator >( interpolator );
     return f( from.constData(), to.constData(), progress );
 }