A number of constants marked obsolete in the cURL library have now been removed:
CURLOPT_CLOSEPOLICY
    
   CURLCLOSEPOLICY_CALLBACK
    
   CURLCLOSEPOLICY_LEAST_RECENTLY_USED
    
   CURLCLOSEPOLICY_LEAST_TRAFFIC
    
   CURLCLOSEPOLICY_OLDEST
    
   CURLCLOSEPOLICY_SLOWEST
    
   A --with-libzip configure option has been added to use a system libzip installation. libzip version 0.11 is required, with 0.11.2 or later recommended.
A new mysqli.rollback_on_cached_plink option was added to rollback connections put back into the persistent connection pool.