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<!--info-header-start--><h1>IsNegativeNumber </h1><blockquote><p>by andrew jarrett <a href="https://github.com/ahrjarrett" target="_blank">@ahrjarrett</a></p></blockquote><p><a href="https://tsch.js.org/25747/play" target="_blank"></a> </p><!--info-header-end-->

Sometimes when working with numeric literals, we need to rule out (or enforce) that the provided number is a positive integer.

To do that, we first need a way to tell if the number is negative.

Write a type-level function IsNegativeNumber that accepts a number N and returns:

• true if N is negative
• false if N is positive
• false if N is 0,
• never if N is number
• never if N is a union

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