I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Determine whether a vector is monotonically increasing
Find the maximum number of decimal places in a set of numbers
Is this triangle right-angled?
Area of a Square
Number of Even Elements in Fibonacci Sequence
Clock Hand Angle 1
Project Euler: Problem 16, Sums of Digits of Powers of Two
Test if two numbers have the same digits
Number of 1s in the Binary Representation of a Number
Return the 'Size' of a String of Code
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