I was getting by with main and alt builds, with scala-pick for cherries, but then also got frustrated with changes sitting in the queue, so a build with all my changes (on the theory that I could exercise them), then also frustrated that I hadn't tried the so-called new optimizer, so added the magnum build, for MAGarcia. I'm not sure it's my job to come up with cool names for other people's branches.

Thanks for the inspiration.  I have so much catching up to do.

BTW, it's my brain that can't context switch.