I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Word Counting and Indexing
Volume of a Parallelepiped
Celsius to Kelvin
02 - Vector Variables 4
Can we make a triangle?
Triangle Numbers Below N
Number of 1s in the Binary Representation of a Number
Right Triangle Side Lengths (Inspired by Project Euler Problem 39)
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