I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Tell me the slope
First N Perfect Squares
Arrange Vector in descending order
Implement simple rotation cypher
03 - Matrix Variables 6
The Dark Side of the Die
Project Euler: Problem 16, Sums of Digits of Powers of Two
Read a Soroban Abacus
Test if a Number is a Palindrome without using any String Operations
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