Now it is possible to do things like:

`ls (>C)`  # gives items with A-B priorities
`ls (<=D)` # gives items with D-Z priorities
`ls (!E)`  # gives all items except those with E priority (also possible
           # with `ls -- -(E)`

and maybe most importantly:
`ls (<Z)` # gives items without priority

PS Don't forget about escaping parentheses when calling from CLI