Extension Manager can crash when last_update_run.global.limitedPackages is stored as object instead of array

[vadkuz]

Environment:

• Flarum: v2.0.0-beta.7
• Extension Manager: v2.0.0-beta.7

Problem:
In some cases, flarum-extension-manager.last_update_run stores global.limitedPackages as an object (example: {"19":"vendor/package"}) instead of an array.
After that, Extension Manager admin page can crash with:
TypeError: e.global.limitedPackages is not iterable

Observed behavior:

• Extension Manager page becomes unstable / may fail to render correctly.
• Navigation in admin can become unreliable after opening that page.

Expected behavior:

• Extension Manager should always render without crashing.
• Stored setting shape should remain consistent (limitedPackages should be a JSON array).

Likely root cause:
array_intersect() preserves original array keys.
When encoded to JSON with non-sequential numeric keys, PHP produces an object instead of an array.

Suggested backend fix (patch snippet):
In src/Listener/ReCheckForUpdates.php, normalize keys before saving:

->with('limitedPackages', array_values(array_intersect($previousPackages, $lastPackages)))

Current code appears to be:

->with('limitedPackages', array_intersect($previousPackages, $lastPackages))

Optional hardening:

• Frontend could defensively handle non-array limitedPackages.
• A one-time normalization for existing malformed flarum-extension-manager.last_update_run values would help existing installs.

If needed, I can also provide a minimal reproducible test case for the setting payload format.