fix parsing non-string slice values

- only string were parsed using wrapped json
 - now we also keep primitive types

internal/reqdata/parameter.go

@@ -79,7 +79,7 @@ func parseParameter(data interface{}) (interface{}, error) {
 
 			// ignore non-string
 			if element.Kind() != reflect.String {
-				result[i] = nil
+				result[i] = element.Interface()
 				continue
 			}