The local store implementation is causing a double serialization #75
Description
When fetching a value from Memcached we deserialize it with the actual coder, but then it is put into the local cache and there it's serialized again but with Marshal to make a copy
This is wasteful, we should be able to store the payload we got from Memcached directly.
Ref: rails/rails#48302
cc @felix-d @Shopify/rails