I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Number of 1s in the Binary Representation of a Number
Basics: 'Find the eigenvalues of given matrix
Area of an equilateral triangle
Beginner's Problem - Squaring
Read a Soroban Abacus
Specific Element Count
Make an N-dimensional Multiplication Table
Check to see if a Sudoku Puzzle is Solved
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