I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Project Euler: Problem 3, Largest prime factor
Return elements unique to either input
Television Screen Dimensions
Project Euler: Problem 16, Sums of Digits of Powers of Two
Recurring Cycle Length (Inspired by Project Euler Problem 26)
Check to see if a Sudoku Puzzle is Solved
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