I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Factorize THIS, buddy
Area of an equilateral triangle
Side of an equilateral triangle
MATLAB Basic: rounding
Pig Latin to English Translator
Read a Soroban Abacus
Roll the Dice!
English to Pig Latin Translator
Project Euler: Problem 16, Sums of Digits of Powers of Two
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