Not guaranteed to be stable, but error fixes common with 6.3 have been backported until 6.x-3.0. Not further fixes will be backported now that 6.x-3.0 has been release: please use 6.x-3.x or 7.x-3.x instead.
Development snapshot. You probably don't want to use this yet unless you're helping develop this module or experimenting with using it for your own module.