accommodate configurations of more than 10,000 things (e.g. sub-boards)
in a single menu (e.g. message group).
This brings this value over the 16-bit thresholds (0x7ffff and 0xffff)
where problems could happen if short's/int16's are used to capture the
return value of uifc.list(), but that's unlikely happening anywhere. Still
a good idea to make sure if you're using this library/headers.