Cm_RedisSession
                                
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                        Credis in /lib to maintain compatibility with Cm_Redis_Cache_Backend?
If you install both you'll end up with two Credis folders: ./lib/Credis ./app/code/local/Credis
Shouldn't it be just one? (./lib)
Magento core includes a copy at lib/Credis which is not updated as frequently and which the github module has no control over so putting another copy in app/code/local/ causes it to load the newest one instead of the one in lib/ without actually overwriting any core files.