[Owncloud] Are display names unique? and related questions

[Andreas Ergenzinger]

Hello,

Since user selection for sharing and most other activities is supposed 
to be based on the display name from now on, the answer to my question 
should obviously be "yes". However, after looking at the OC_User class 
as well as the associated user backend and interface classes, I am not 
sure that this uniqueness is enforced anywhere.

Am I missing something, or do we need a displayNameExists($displayName) 
function in the user interface?

I am also not sure about the future role of the getUsers($search = '', 
$limit = null, $offset = null) method, apart from providing a list of 
all users if no search parameter is specified. It seems to me that the 
function is completely replaced by getDisplayNames($search = '', $limit 
= null, $offset = null) in all other cases. Besides backward 
compatibility, is there another reason for needing approximate search of 
uids/login names?

Andreas