`wipe` cleared elements with a bare `pairs` loop, which leaves Lua 5.0's remembered table size
stale (the `getsizes` side store `luaL_setn` writes). TurtleWoW's LFT fills its group list, wipes
it on the next `S2C_GROUPS_LIST_UPDATE` start, and refills; the refill's `getn` answered the old
length, so `LFT_UpdateGroupsList` read nil entries and `CustomSort` raised on `value.category`.
Take `Globals.lua:126`'s body instead: a `tremove` walk down from `getn` resets the size, then
clear the non-array keys. The test now pins the return and the size reset.
chairmanpow
6eaba32006