* Array of 8 INT32's natively embedded into savedata (net and SP)!
* Initialised to zero whenever a new save (or equivalent) is started, otherwise untouched by the base game.
* Requires reservation to avoid clobber-conflicts.
    * Access via `reserveLuabanks()` - returns a read-write userdata.
    * Assign userdata to local variable or global rawset to use later.

Mostly for future SUGOIlikes, but I'm sure someone could figure out an unrelated usage eventually.