Thanks. Got a little more research ahead of me it appears.
Got ahold of the warranty cylinder and got it apart but it revealed
nothing. Except that it's a typical GM manually coded 7 wafer design
lock. Nothing fancy, it's not even a sidebar lock. Apparently GM is
using the codeable job for a replacement.
Found some patent docs for the codeable cylinders that explained a bit
about how they work but no real good illustrations of the actual guts.
But it's not surprising that STRATTEC hasn't put out any really
detailed info on their invention. But it sure would make it a lot
easier for me to wrap my brain around if they did! And they probably
don't want me to order one at work just so I can open it up to inspect
how it works. They're a little spendy, about $80 list price.