I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
surface of a spherical planet
First N Perfect Squares
Find the sum of the elements in the "second" diagonal
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Recurring Cycle Length (Inspired by Project Euler Problem 26)
Cache me Outside
Next Lower Power of B
Next Higher Power of B
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