Dear Admin,
There are a duplicated thread at this URL: A BUG FOUND in "has_capability" function.
Thanks.
Ahmed
That thread also contains a number of useful replies; thus it is not necessary for it to be deleted.
If duplicate posts are noticed soon, before they have any replies, it's fine for them to be deleted. However, it's not always possible for moderators to notice them soon, since they may be in a different time zone.