The Memcached extension does not provide enough information to PHP's
Reflection API to allow mock objects to be generated correctly. We'll
skip the affected tests until php-memcached-dev/php-memcached#126 has
been resolved.
People should switch to Memcached instead. The underlying extension is
better maintained and provides improved features and performance.
Collapse the persistent and persistentId settings, while also making
non-persistent connections the default. Persistent connections should be
an opt-in feature as having them enabled by default could go very wrong
on shared hosting environments.
