number_is_eq(num1, ...)
number_is_lt(num1, ...)
number_is_gt(num1, ...)
number_is_lteq(num1, ...)
number_is_gteq(num1, ...)
Compare an arbitary number of numeric values. Return true if the relation holds,
otherwise return false.
Number_is_eq return true if all its arguments are equal.
Number_is_lt return true if their arguments are monotonically increasing, i.e., each
argument is greater than the preceding ones.
Number_is_gt return true if their arguments are monotonically decreasing, i.e., each
argument is less than the preceding ones.
Number_is_lteq return true if their arguments are monotonically nondecreasing,
i.e., each argument is not less than the preceding ones.
Number_is_lteq return true if its arguments are monotonically non-increasing.
number_is_eq(7, 7)
// true
number_is_lteq(1, 2, 3, 3, 4, 5)
// true