docs: function findx0TinyB(a, y) {
        var c1;
  
        c1 = (a - 1) * Math.log(y);
        return y + Polynomial.new([
           // c5
           (a - 1) * Polynomial.new([
              -0.25, (11 * a - 17) / 6, -3 * a * a + 13 * a - 13,
              (2 * a * a * a - 25 * a * a + 72 * a - 61) / 2,
              (25 * a * a * a - 195 * a * a + 477 * a - 379) / 12
           ]).evalAt(c1),
           // c4
           (a - 1) * Polynomial.new([
              1 / 3, (3 * a - 5) / 2, a * a - 6 * a + 7,
              (11 * a * a - 46 * a + 47) / 6
           ]).evalAt(c1),
           // c3
           (a - 1) * (-0.5 * c1 * c1 + (a - 2) * c1 + (3 * a - 5) / 2),
           // c2
           (a - 1) * (1 + c1),
           // c1
           c1
        ]).evalAt(1 / y);
     }