Advanced search "n" tag does not work with "x" value.

[fefeslon]

Description:
Advanced search "n" tag does not work with "x" value.
That means that one is not able to search for cards with income "X" using the "s" tag.

Example:
Summer Harvest - card ID 04039

n:x does not work (won't find any cards)
n>99 does not work (won't find any cards); 99 as the assumption that X is infinite number (like for card's cost)

Expected result:
I'd expect it to work the same way the cost ("o" tag) is implemented, that means one is able to search for it using the examples above.