bug#27488: du -tX -t-Y won't exclude or select an interval of SIZE

[f0rhum]

I know man clearly states "exclude entries smaller  than  SIZE  if 
positive,  or entries greater than..."
I don't know if it is a restriction in my 8.21, but only the last -t
option in my command line applies.
If not, maybe a feature could allow this like du -t3G-5G or -t3G -t-5G
could show dirs from 3 to 5G
and -t-3G5G or -t5G -t-3G would show all others.
Okay, I guess this would be an opened door for guys requesting more than
one intervall ;)