Merge pull request storybookjs#31578 from storybookjs/kasper/fix-read-only-arrays

Core: Make sure to only mutate writable arrays

Author: kasperpeulen

code/core/src/test/preview.ts

@@ -59,7 +59,9 @@ export const traverseArgs = (value: unknown, depth = 0, key?: string): unknown =
     // we loop instead of map to prevent this lit issue:
     // https://github.com/storybookjs/storybook/issues/25651
     for (let i = 0; i < value.length; i++) {
-      value[i] = traverseArgs(value[i], depth);
+      if (Object.getOwnPropertyDescriptor(value, i)?.writable) {
+        value[i] = traverseArgs(value[i], depth);
+      }
     }
     return value;
   }