I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Sums with Excluded Digits
middleAsColumn: Return all but first and last element as a column vector
Basics: 'Find the eigenvalues of given matrix
Add two numbers
Area of a Square
Specific Element Count
Test if two numbers have the same digits
Pull the variable y_correct from the Caller's Workspace
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