I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Times 2 - START HERE
Test for balanced parentheses
Project Euler: Problem 3, Largest prime factor
Sum the 'edge' values of a matrix
ASCII Birthday Cake
Roll the Dice!
Test if a Number is a Palindrome without using any String Operations
Test if two numbers have the same digits
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