# Contributors * Brett Alistair Kromkamp (brettkromkamp@gmail.com): Post basic idea online. * Xiaming Chen (chenxm35@gmail.com): Finished primary parts and made the library freely public. * Holger Bast (holgerbast@gmx.de): Replaced list with `dict` for fast node index and optimized the performance. * Ilya Kuprik (ilya-spy@ynadex.ru): Added ZIGZAG tree-walk algorithm to tree traversal. and other committers etc. Thank you all.