+Range fields take one or two arguments specifying lower and upper
+bounds. One argument is interpreted as identical upper and lower
+bounds. Either upper or lower bound may be specified as ``""`` or
+``*`` to specify the lowest possible lower bound or highest possible
+upper bound.
+
+``lastmod`` ranges support negative arguments, interpreted relative to
+the most recent database revision (see :option:`count --lastmod`).
+