~~~~~~~~~~~~~~~~~~
- BREAKING CHANGE: This release switches to a single SERIALIZED connections.
Previously it used a READ COMMITED and a SERIALIZED connection in parallel,
switching to the READ COMMITED connection for readonly queries and using
the SERIALIZED connection for write queries.
Using a serialized connection for everything reduces speed slightly (though
we haven't been able to measure the effect on our lowish traffic sites). But
it makes it easier to use libres with an existing connection when integrating
it.
It also simplifies the code by quite a bit.