Idea: Support alternate serializers such as igbinary, msgpack, etc for arrays/objects

[TysonAndre]

Motivation:

1. Speed up unserialization, reduce network traffic
2. Allow storing more objects/arrays in the same amount of RAM on a memcached server.

A different PECL (memcached) does this through the use of an option defaulting to the php serializer for objects/arrays https://www.php.net/manual/en/memcached.constants.php . Memcached integer flags are used to store the serializer type in that PECL.

https://github.com/igbinary/igbinary

Igbinary is a drop in replacement for the standard php serializer. Instead of the time and space consuming textual representation used by PHP's serialize, igbinary stores php data structures in a compact binary form. Memory savings are significant when using memcached, APCu, or similar memory based storages for serialized data. The typical reduction in storage requirements are around 50%. The exact percentage depends on your data.

(I'm a maintainer of igbinary)

https://github.com/msgpack/msgpack-php