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Changes between Initial Version and Version 1 of Ticket #20564, comment 57

initial	v1
3	3	What I mean is at the lowest level: we know the expected keys, so `array( 'a' => '', 'b' => '', 'c' => 'something' );` doesn't have to be serialized, saved to the db and unserialized again when getting the data. We can remove the empty keys, save `array( 'c' => 'something' );` and then add the empty keys on getting the data. This will work in exactly the same way as saving the original array.
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	5	The same is true when getting/setting the post format meta on revision posts. We know there are 7 meta keys, no need to add the empty.
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5	7	> I can try and answer this with a similar question :) When restoring from a revision, do empty fields (title or content) overwrite the corresponding values in the main post?
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