I'd suggest adding test cases in which xlow<0 (and maybe also xhigh<0).
Determine if a Given Number is a Triangle Number
Is my wife right? Now with even more wrong husband
Back to basics 19 - character types
Reindex a vector
04 - Scalar Equations 2
The Dark Side of the Die
Number of Circles in a Number
Make an N-dimensional Multiplication Table
Return the Nth Output from an Input Command
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