In Python this is a magical special case, but in Icon/Unicon it falls out somewhat naturally from the language semantics; comparisons don't return Boolean values, but rather fail (returning no value) or succeed (returning a usually unused value which is chosen to be, IIRC, the right-hand operand).
And in SQL you have
`x-coordinate` between `lower-bound` - 1 and `upper-bound` + 1