I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Who Has the Most Change?
Determine if a Given Number is a Triangle Number
Find out missing number from a vector of 9 elements
Free passes for everyone!
Solve the Sudoku Row
Recurring Cycle Length (Inspired by Project Euler Problem 26)
Return the 'Size' of a String of Code
N-Dimensional Array Slice
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