[wp-trac] [WordPress Trac] #11753: 3.0 upgrader needs to lowercase usernames

[WordPress Trac]

#11753: 3.0 upgrader needs to lowercase usernames
-------------------------------+--------------------------------------------
 Reporter:  Denis-de-Bernardy  |       Owner:     
     Type:  defect (bug)       |      Status:  new
 Priority:  normal             |   Milestone:  3.0
Component:  General            |     Version:  3.0
 Severity:  major              |    Keywords:     
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 I'm opening this in advance so we don't forget. ms-default-filters.php has
 the following filter:

 {{{
 add_action ( 'sanitize_user', 'strtolower_usernames', 10, 3 );
 }}}

 after upgrading to 3.0, some users may end up wanting to turn their
 existing sites in a Multisite install. In the event this happens, we
 should:

  - fix the strtolower_usernames() function if needed (see #11751)
  - lowercase all usernames accordingly
  - double check that previous logins still work (they should work fine,
 see #5472)

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Ticket URL: <http://core.trac.wordpress.org/ticket/11753>
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