I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Say something funny
Is it an Armstrong number?
03 - Matrix Variables 2
03 - Matrix Variables 4
Binary code (array)
Television Screen Dimensions
Recurring Cycle Length (Inspired by Project Euler Problem 26)
Square Digits Number Chain Terminal Value (Inspired by Project Euler Problem 92)
Inhomogenous Depth Scale Interpolation
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
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