I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Roll the Dice!
Magic is simple (for beginners)
Given area find sides
Find the sides of an isosceles triangle when given its area and height from its base to apex
Project Euler: Problem 16, Sums of Digits of Powers of Two
Next Lower Power of B
Give the Shortest Path Through The Maze
Read a Soroban Abacus
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