This is a continuation of #16,

Prior to 2.4.0, special bags (item family) was essentially an enum instead of the bitmask it is today.

There's still work to do to fix the display of special bags. (IsSpecialBag for example still has the bitfield values) so special bags show with a ? instead of an appropriate letter. I'm trying to find a reference from before 2.4.0 when it changed so we have an actual list of values to work with.