The command /xp with L is don'y work.

I expact to get a big level, so I pun a number like 11234543234. I see nothing happen so I decrease the number still I arive to 1,and it did not work.
If I understand it, I will need to get the level which I write there.

*What actually happened was...: In chat has appeared: Given (number) levels to Nicu(my nickname, not a premium acount) *
I don't get any level, so I thing was because I was in creative, so I go to survival, and still don't works. The "experment" was taket on a server wich was made with yours client

Steps to Reproduce:
1. Take the server.
2. Use command.
3. Die burning in fire.

PS: sorry for the gramatical mistakes, but I'm not from USA/UK