laravel/laravel — pull request #1528 by TheShiftExchange (2012-12-17 07:52:29+00:00)
Title: Remove underscore from default cookie name

Internet explorer can sometimes reject a cookie with an underscore. This caused numerous issues on CI - there are lots of CI forums posts about the issue, because the default CI cookie contained an underscore (apart from other issues which I wont go into).

So I thought it makes sense to remove it from Laravel to prevent any similar issues from popping up in the future.