@oazabir -
The provider stores the header and body of session separately; I didn’t write the initial code, but it seems that it’s an optimization so the header state can be compared without pulling the body over the wire during a write. Note that while it takes 2x the hits to the backend, memcached is very fast and the reads/writes are in-memory.
I have considered to a complete re-write on a separate branch and storing the header/body as as single value, but I am not sure yet when that project could get started.
-Jeff