升级到 Laravel 5.2 会使所有会话失效

从Laravel 5.1.17升级到5.2.我的config/auth.php本书最初包含:

'driver' => 'eloquent',
'model'  => 'Project\User',
'table'  => 'users',

New file is the same as the default, except with the updated namespace.

'defaults' => [
    'guard' => 'web',
    'passwords' => 'users',
],
'guards' => [
    'web' => [
        'driver' => 'session',
        'provider' => 'users',
    ],
    'api' => [
        'driver' => 'token',
        'provider' => 'users',
    ],
],
'providers' => [
    'users' => [
        'driver' => 'eloquent',
        'model' => Project\User::class,
    ],
],

My env SESSION_DRIVER is redis. I did not clear anything from Redis. (Note, this also happened in my other projects where driver was file, but I didn't care about it as much for them.)

我有两个分支，L5.2和MASTER(位于5.1.17).在切换分支之后，我简单地运行composer install

If I login on master, then switch to L5.2, I am logged out
If I switch back to master, I am logged back in
If I login on L5.2, then switch to master, I stay logged in
If I switch back to L5.2, I stay logged in

I'm hesitant to upgrade if it's going to invalidate all of my users' sessions and force them to login again. Is there a way to avoid this?

唯一修改过的其他文件是composer.json、composer.lock、app/Exceptions/Handler.php和config/app.php；没有触及Auth.