fix: always dispatch a fresh BigJs object to Saved attribute

Likely because of some mobx magic the object returned by computed is frozen at times.
And this leads to internal crashes in the framework.
Prevent this bu passing fresh object to setValue

Author: r0b1n

packages/pluggableWidgets/datagrid-number-filter-web/CHANGELOG.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+### Fixed
+
+- We fixed an issue where widgets with the Saved attribute configured would crash in some cases.
+
 ## [3.8.1] - 2026-02-19
 
 ### Changed

packages/shared/widget-plugin-filtering/src/helpers/useBasicSync.ts

@@ -31,7 +31,8 @@ export function useBasicSync<T extends string | Big>(props: Props<T>, store: Inp
 function createPusher<T extends string | Big>(pbox: PropBox<T>): Pusher<T> {
     return ([value1, _value2, _value3]) => {
         const props = pbox.current;
-        props.valueAttribute?.setValue(value1 ?? undefined);
+
+        props.valueAttribute?.setValue(((value1 instanceof Big ? new Big(value1) : value1) as T) ?? undefined);
 
         if (props.onChange?.canExecute) {
             props.onChange?.execute();