This tweak is not a patch, per se - it mitigates against an iMessage RCE exploit in a similar fashion to how Apple mitigated it in iOS 12.4.1 through 13.1.3.

It is VERY experimental and may cause a few slow downs or issues using iMessage (and iOS itself) - but anything's better than being l33t h4x0r'd.

(Please note that this patch only fixes very few vulnerabilities and should not be used as a catch-all.)