Is ext4 stable on 11.10?

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http://askubuntu.com – I have seen that Ubuntu 11.10 is offering Ext4 as default file system. As I have googled some time on ext4 and found that ext3 is quite stable that ext4 as it still has some bugs. Even the Ubuntu Documentation is referring Ext3. Link So, I would like to know whether Ext4 is currently stable on 11.10 or not than Ext3 (HowTos)