The array-key_exists() function maps changed to use all string keys so as not to raise Warning on a non-string key. The boolean false value that get_cfg_var() or ini_get() might return is changed to string "false" to be a valid string to check against array keys. - Jeremy Trask
Replace reference to v2 with v3 in Stash 3 and S33 init.php files. - Glenn Ansley