https://bugzilla.wikimedia.org/show_bug.cgi?id=61227

--- Comment #2 from Ori Livneh <o...@wikimedia.org> ---
We don't need to port it.

MemcachedPeclBagOStuff stores the serializer in the bitfield accompanying each
value, and will use the correct deserializer regardless of which serializer is
currently configured. Switching to the PHP serializer means any new keys
written from now on will use PHP serialization, while existing values will
continue to be readable.

We've done this for Labs already.

TODOs:
* Make the switch in prod
* Devise a tool for assessing % of keys that still use igbinary (for example,
tcpdump 1 min of memcached GETs and check each key's serialization flag)

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