better ValueAs

v2/context_helper.go

@@ -1,5 +1,7 @@
 package serverevents
 
+import "encoding/json"
+
 func CreateMetaDataFilter[T any](c IContext, metaDataSelector func(IContext) T, vgl func(a T, b T) bool) func(context IContext) bool {
 	return func(context IContext) bool {
 		metaA := metaDataSelector(c)
@@ -15,9 +17,13 @@ func MetadataAs[T any](context IContext, key string) (T, bool) {
 
 func ValueAs[T any](data any) (T, bool) {
 	var v T
-	if data == nil {
+	str, err := json.Marshal(data)
+	if err != nil {
 		return v, false
 	}
-	res, ok := data.(T)
-	return res, ok
+	err = json.Unmarshal(str, &v)
+	if err != nil {
+		return v, false
+	}
+	return v, true
 }