For example: Pipe schedules - when sorted by the pipe size - does not work either ascending or descending for fractional sizes. Revit is very good at knowing what the real size is for all items, except for this feature. Instead of listing by the actual size of the element, it does a sort of alphabetical listing.
In the attached image, the schedule is sorted by "Size"
1 1/2"
1"
1/2"
2 1/2"
2"
3/4"
This list should say
1/2"
3/4"
1"
1 1/2"
2"
2 1/2"