'mean' optimized JS

gistfile1.js

function ob(a) {
    for (var b = pb(a), c = 0; b.fa < b.M.oa;) {
        H();
        var d = b.la;
        if (d)
            if ("number" !== typeof d) var d = y(d),
                e = z().g,
                d = null === d ? null === e : d.q(e);
            else d = !1;
        else d = !0;
        d || (H(), K(), H(), e = b.la, d = qb(a, b.za), H(), e ? "number" !==
            typeof e ? e = y(e) : (H(), e = e >=
                (H(), 0) && e < H().l ? y((new I).d(e | 0, 0, 0)) : F(z(), +
                    e)) : e = y(z().g), H(), d ?
            "number" !== typeof d ? d = y(d) : (H(), d = d >= (H(), 0) &&
                d < H().l ? y((new I).d(d | 0, 0, 0)) :
                F(z(), +d)) : d = y(z().g), d = J(0, rb(e, d)), c = H()
            .L.plus(c, d));
        sb(b)
    }
    H();
    b = c;
    H();
    a = a.Y;
    return ("number" === typeof b ? +b : M(y(b))) / ("number" ===
        typeof a ? +a : M(y(a)))
}