Today I had to dig through the Memcached adapter codebase for the second time because there is a missing option in the documentation,binary_protocol. This is pretty important because the default istrue and I had to disable it to be able to use it in production withmcrouter, that doesn't support it.

The code says:https://github.com/symfony/symfony/blob/e1b352ebe03e9423d438852de1b6212b1aae62c8/src/Symfony/Component/Cache/Adapter/MemcachedAdapter.php#L86
* By default, the binary protocol, no block, and libketama compatible options are enabled.

This is a pretty important information to be hidden in the source code.