fix: proxy with symbol

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.5.3] - 2026-03-31
+
+### Fixed
+
+- **Symbol property access on proxied state** — accessing or setting Symbol-keyed properties (e.g. those used internally by Svelte or JavaScript runtimes) on a proxied state object no longer throws or triggers change tracking incorrectly; symbols are now passed through transparently
+
 ## [1.5.2] - 2026-03-31
 
 ### Fixed

docs/index.html

@@ -5,7 +5,7 @@
 		<link rel="icon" href="favicon.png" />
 		<title>svstate demo</title>
 		<meta name="viewport" content="width=device-width, initial-scale=1" />
-		<script type="module" crossorigin src="/svstate/assets/index-2ubidnA3.js"></script>
+		<script type="module" crossorigin src="/svstate/assets/index-CXrV2wig.js"></script>
 		<link rel="stylesheet" crossorigin href="/svstate/assets/index-Ck8pee3s.css">
 	</head>
 

package.json

@@ -1,6 +1,6 @@
 {
   "name": "svstate",
-  "version": "1.5.2",
+  "version": "1.5.3",
   "description": "Supercharged $state() for Svelte 5: deep reactive proxy with validation, cross-field rules, computed & side-effects",
   "author": "BCsabaEngine",
   "license": "ISC",

src/proxy.ts

@@ -21,7 +21,8 @@ export const ChangeProxy = <T extends object>(source: T, changed: ProxyChanged<T
   const createProxy = (target: object, parentPath: string): object =>
     new Proxy(target, {
       get(object, property) {
-        const value = (object as Record<string, unknown>)[property as string];
+        if (typeof property === 'symbol') return (object as Record<symbol, unknown>)[property];
+        const value = (object as Record<string, unknown>)[property];
         if (isProxiable(value)) {
           const pathSegment = Number.isInteger(Number(property)) ? '' : String(property);
           const childPath = pathSegment ? (parentPath ? `${parentPath}.${pathSegment}` : pathSegment) : parentPath;
@@ -30,9 +31,13 @@ export const ChangeProxy = <T extends object>(source: T, changed: ProxyChanged<T
         return value;
       },
       set(object, property, incomingValue) {
-        const oldValue = (object as Record<string, unknown>)[property as string];
+        if (typeof property === 'symbol') {
+          (object as Record<symbol, unknown>)[property] = incomingValue;
+          return true;
+        }
+        const oldValue = (object as Record<string, unknown>)[property];
         if (oldValue !== incomingValue) {
-          (object as Record<string, unknown>)[property as string] = incomingValue;
+          (object as Record<string, unknown>)[property] = incomingValue;
           const pathSegment = Number.isInteger(Number(property)) ? '' : String(property);
           const fullPath = pathSegment ? (parentPath ? `${parentPath}.${pathSegment}` : pathSegment) : parentPath;
           changed(data as T, fullPath, incomingValue, oldValue);