Infinity and NaN

I found the values of Infinity and NaN in my data, but I don’t know how they appeared. Can you tell me about the premise operation that these two values will appear, so I can check it out

With floats, if you divide zero by zero, you get NaN (Not a Number); if you divide anything else by zero, you get positive or negative infinity.

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Looking through the official documentation, I didn’t find anything about NaN and
Infinity’s judgment, which seems to be a common method in other languages, is missing in motoko.

module {
  public func isNaN(v:Float): Bool {
    return ((v < 0.000) == false) and ((v > 0.000) == false)
  };
  public func isInfinite(v:Float): Bool {
    return v > 1.8e307 
  }
}

This is the method I wrote to judge NaN and Infinity, what’s wrong with it. . if so. Please point out where I am wrong

0 is neither <0 or >0. And >1.3e308 tests for +∞ but not -∞ (and floats can in fact go up to 1.79e308).