@andredtweets @FioraAeterna Actually I misread it. abs would be the other way around, sqrt(x^2). As written it's not abs.
@andredtweets @FioraAeterna Rather the code as written was x<0 ? NAN : bad_approx(x).
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@andredtweets @FioraAeterna Rather the code as written was x<0 ? NAN : bad_approx(x).