diff --git a/all_test.go b/all_test.go
index 7cf7d57b..0259b00c 100644
--- a/all_test.go
+++ b/all_test.go
@@ -103,6 +103,7 @@ type GoType struct {
 	IntValue     int
 	Int64Value   int64
 	Int32Value   int32
+	Uint32Value  uint32
 	Float64Value float64
 	Float32Value float32
 	AnyValue     interface{}
@@ -191,7 +192,11 @@ var getSetTests = []struct{ set, get interface{} }{
 	{"value", same},
 	{true, same},
 	{false, same},
-	{int64(42), int64(42)},
+	{int(42), same},
+	{int32(42), int(42)},
+	{int64(42), same},
+	{uint32(42), same},
+	{uint64(42), same},
 	{float64(42), same},
 	{float32(42), same},
 	{new(GoType), same},
diff --git a/cpp/capi.cpp b/cpp/capi.cpp
index cfba0880..f9329283 100644
--- a/cpp/capi.cpp
+++ b/cpp/capi.cpp
@@ -611,6 +611,12 @@ void unpackDataValue(DataValue *value, QVariant_ *var)
     case DTInt32:
         *qvar = *(qint32*)(value->data);
         break;
+    case DTUint64:
+        *qvar = *(quint64*)(value->data);
+        break;
+    case DTUint32:
+        *qvar = *(quint32*)(value->data);
+        break;
     case DTFloat64:
         *qvar = *(double*)(value->data);
         break;
@@ -667,13 +673,23 @@ void packDataValue(QVariant_ *var, DataValue *value)
         *(qint8*)(value->data) = (qint8)qvar->toInt();
         break;
     case QMetaType::LongLong:
+        // Some of these entries will have to be fixed when handling platforms
+        // where sizeof(long long) != 8 or sizeof(int) != 4.
         value->dataType = DTInt64;
         *(qint64*)(value->data) = qvar->toLongLong();
         break;
+    case QMetaType::ULongLong:
+        value->dataType = DTUint64;
+        *(quint64*)(value->data) = qvar->toLongLong();
+        break;
     case QMetaType::Int:
         value->dataType = DTInt32;
         *(qint32*)(value->data) = qvar->toInt();
         break;
+    case QMetaType::UInt:
+        value->dataType = DTUint32;
+        *(quint32*)(value->data) = qvar->toUInt();
+        break;
     case QMetaType::VoidStar:
         value->dataType = DTUintptr;
         *(uintptr_t*)(value->data) = (uintptr_t)qvar->value<void *>();
diff --git a/cpp/capi.h b/cpp/capi.h
index ca4ae998..64d21cb7 100644
--- a/cpp/capi.h
+++ b/cpp/capi.h
@@ -43,10 +43,12 @@ typedef enum {
     DTBool    = 11,
     DTInt64   = 12,
     DTInt32   = 13,
-    DTUintptr = 14,
-    DTFloat64 = 15,
-    DTFloat32 = 16,
-    DTColor   = 17,
+    DTUint64  = 14,
+    DTUint32  = 15,
+    DTUintptr = 16,
+    DTFloat64 = 17,
+    DTFloat32 = 18,
+    DTColor   = 19,
 
     DTGoAddr       = 100,
     DTObject       = 101,
diff --git a/datatype.go b/datatype.go
index 492e4664..487a35f7 100644
--- a/datatype.go
+++ b/datatype.go
@@ -89,6 +89,12 @@ func packDataValue(value interface{}, dvalue *C.DataValue, engine *Engine, owner
 	case int32:
 		dvalue.dataType = C.DTInt32
 		*(*int32)(datap) = value
+	case uint64:
+		dvalue.dataType = C.DTUint64
+		*(*uint64)(datap) = value
+	case uint32:
+		dvalue.dataType = C.DTUint32
+		*(*uint32)(datap) = value
 	case float64:
 		dvalue.dataType = C.DTFloat64
 		*(*float64)(datap) = value
@@ -132,6 +138,10 @@ func unpackDataValue(dvalue *C.DataValue, engine *Engine) interface{} {
 		return *(*int64)(datap)
 	case C.DTInt32:
 		return int(*(*int32)(datap))
+	case C.DTUint64:
+		return *(*uint64)(datap)
+	case C.DTUint32:
+		return *(*uint32)(datap)
 	case C.DTUintptr:
 		return *(*uintptr)(datap)
 	case C.DTFloat64:
@@ -257,6 +267,10 @@ func typeInfo(v interface{}) *C.GoTypeInfo {
 	// TODO Only do that if it's a struct?
 	vtptr := reflect.PtrTo(vt)
 
+	if vt.Kind() != reflect.Struct {
+		panic(fmt.Sprintf("handling of %s (%#v) is incomplete; please report to the developers", vt, v))
+	}
+
 	numField := vt.NumField()
 	numMethod := vtptr.NumMethod()
 	privateFields := 0
diff --git a/qml.go b/qml.go
index 54accb86..233ae896 100644
--- a/qml.go
+++ b/qml.go
@@ -530,12 +530,13 @@ func (obj *Common) Property(name string) interface{} {
 // Int panics if the property cannot be represented as an int.
 func (obj *Common) Int(property string) int {
 	switch value := obj.Property(property).(type) {
+	case int64:
+		return int(value)
 	case int:
 		return value
-	case int64:
-		if int64(int(value)) != value {
-			panic(fmt.Sprintf("value of property %q is too large for int: %#v", property, value))
-		}
+	case uint64:
+		return int(value)
+	case uint32:
 		return int(value)
 	case uintptr:
 		return int(value)
@@ -552,10 +553,14 @@ func (obj *Common) Int(property string) int {
 // Int64 panics if the property cannot be represented as an int64.
 func (obj *Common) Int64(property string) int64 {
 	switch value := obj.Property(property).(type) {
-	case int:
-		return int64(value)
 	case int64:
 		return value
+	case int:
+		return int64(value)
+	case uint64:
+		return int64(value)
+	case uint32:
+		return int64(value)
 	case uintptr:
 		return int64(value)
 	case float32:
@@ -571,9 +576,13 @@ func (obj *Common) Int64(property string) int64 {
 // Float64 panics if the property cannot be represented as float64.
 func (obj *Common) Float64(property string) float64 {
 	switch value := obj.Property(property).(type) {
+	case int64:
+		return float64(value)
 	case int:
 		return float64(value)
-	case int64:
+	case uint64:
+		return float64(value)
+	case uint32:
 		return float64(value)
 	case uintptr:
 		return float64(value)