chore: dedupe safe_not_equal in svelte/store (#12160)

Author: Conduitry

packages/svelte/src/store/index.js

@@ -1,4 +1,5 @@
 import { noop, run_all } from '../internal/shared/utils.js';
+import { safe_not_equal } from '../internal/client/reactivity/equality.js';
 import { subscribe_to_store } from './utils.js';
 
 /**
@@ -21,15 +22,6 @@ export function readable(value, start) {
 	};
 }
 
-/**
- * @param {any} a
- * @param {any} b
- * @returns {boolean}
- */
-function safe_not_equal(a, b) {
-	return a != a ? b == b : a !== b || (a && typeof a === 'object') || typeof a === 'function';
-}
-
 /**
  * Create a `Writable` store that allows both updating and reading by subscription.
  *