Cache optimizations

[Relevad]

Hi,

I've recently been making some custom modifications to wordpress core that reduce the resource load on our object-caching system.
I cannot see any drawbacks to these modifications, but I have to defer to the wp-core development team on this one and therefore assume I've missed something.
I want to know if there is anything I overlooked while making these modifications.
If there are no drawbacks, then perhaps the changes could be rolled into wp-core officially (and then I won't have svn showing files as modified all the time)

Explanation: (broken down into sections)
1) I noticed a huge amount of 'extra' queries to the object-cache.
Many of them originating from calls to wp_load_alloptions()
I believe with my modifications wp_load_alloptions() only needs to be called in one place instead of many, and that is within the definition of the object-cache itself.

2) I've also reduced redundant queries by changing the assumption that a key doesn't exist to a key does exist. Check the cache for the key first instead of checking the 'negative' cache for the key first.

3) Some minor fixes in options.php

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All file changes (from svn diff) available at this link:
​http://pastebin.com/5vPGCCt7

[dd32]

pastebin link in diff uploaded form (paths corrected)

[Relevad]

Just noticed I left some debug code in the wp-includes/cache.php

the error_log() calls are obviously not required.