I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Find the peak 3n+1 sequence value
Find the biggest empty box
Make a vector of prime numbers
Find the dimensions of a matrix
Find my daddy long leg (No 's')
Number of 1s in the Binary Representation of a Number
Parse me a Lisp
Lychrel Number Test (Inspired by Project Euler Problem 55)
Return the Nth Output from an Input Command
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