getUserName function

Can the getUserName function like the getUserId where values passed to the function will yield different types of information?
where as currently:
getUserId() gets current user id
getuserId(somename) gets the id of user somename.

would like to see:
getUserName(id) yields name of userid id

in 2.1b4 you can give the getUserName a parameter user_id.
Then it will not return the current user but the name of the id you give

Great! Thanks!