https://bugzilla.wikimedia.org/show_bug.cgi?id=15676





--- Comment #5 from Adam Cuerden <[email protected]>  2009-11-04 20:18:01 UTC 
---
I see no good reason to go forwards with this, and think it should be scrapped.
Possible problems include: 

* If an image gets corrupted, but a stored hash is the one being compared, the
system breaks.
* Uploading the image again is, for people who aren't utter experts in Wiki
work - and that includes me, an admin on commons - the only obvious way to
regenerate thumbnails.
* There is no evidence of actual good  that this will do.
* There is a small chance of two images having the same hash. As the number of
uploads increases, the chance of this affecting someone does as well.
* The case for implementation is not established.

Please do not go forwards with this. 


There is no good reason to restrict this behaviour in the absence of evidence 
that it is causing any problem.


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