Shenghan0329

I also have the same issue. From `passport.use(User.createStrategy());`, I'm having the trouble to use "email" in replace of "username" for user authentification. Version: 8.0.0

Hello, for Sudoku-solving algorithm, the website [AnySudokuSolver](https://anysudokusolver.com/) has a non-recursive algorithm and input checks. The algorithm also works well for this input: `........................................................8.................6......`.   The codes from this website...