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NSNotificationCenter : multiple messages sent to the same observer?

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NSNotificationCenter : multiple messages sent to the same observer?

Subject: NSNotificationCenter : multiple messages sent to the same observer?
From: Iceberg-Dev <email@hidden>
Date: Sun, 22 Feb 2009 00:06:06 +0100

I just discovered something recently. If you register an observer with the same name/object/selector twice, you get the notification twice when you post it.

Isn't the NSNotificationCenter supposed to prevent this?
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