docs: function set(out, m00, m01, m02, m10, m11, m12, m20, m21, m22) {
    out[0] = m00;
    out[1] = m01;
    out[2] = m02;
    out[3] = m10;
    out[4] = m11;
    out[5] = m12;
    out[6] = m20;
    out[7] = m21;
    out[8] = m22;
    return out;
  }