fix(endpoint): use .toString() workaround for fractional part error

Author: platosha

packages/java/endpoint/src/main/java/com/vaadin/hilla/EndpointInvoker.java

@@ -340,12 +340,15 @@ private Object[] getVaadinEndpointParameters(
 
         for (int i = 0; i < javaParameters.length; i++) {
             Type parameterType = javaParameters[i];
-            Type incomingType = parameterType;
             try {
+                // TODO: remove intermediate .toString() conversion workaround,
+                // see
+                // https://github.com/FasterXML/jackson-databind/issues/5319#issuecomment-3384692163
                 Object parameter = endpointObjectMapper
                         .readerFor(endpointObjectMapper.getTypeFactory()
-                                .constructType(incomingType))
-                        .readValue(requestParameters.get(parameterNames[i]));
+                                .constructType(parameterType))
+                        .readValue(requestParameters.get(parameterNames[i])
+                                .toString());
                 endpointParameters[i] = parameter;
 
                 if (parameter != null) {