I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Remove the vowels
Rotate a Matrix
Output any real number that is neither positive nor negative
Test if two numbers have the same digits
Inhomogenous Depth Scale Interpolation
Return the 'Size' of a String of Code
Test if a Number is a Palindrome without using any String Operations
Number of 1s in the Binary Representation of a Number
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