denominator

static VALUE
float_denominator(VALUE self)
{
    double d = RFLOAT_VALUE(self);
    VALUE r;
    if (isinf(d) || isnan(d))
        return INT2FIX(1);
    r = float_to_r(self);
    if (canonicalization && k_integer_p(r)) {
        return ONE;
    }
    return nurat_denominator(r);
}