The Samba-Bugzilla – Bug 13361
Multiple LDB results returned for multi-valued, mixed case indexed attributes
Last modified: 2018-03-29 09:02:17 UTC
Samba does not prevent storage of multiple values in a single attribute if those values differ in binary, even if they are casewise equal.
That is bug 8929, however there is also the issue that if these are found, the object will be returned twice (once for each case-wise duplicate) unless GUID index mode is in use (where they are correctly suppressed).