Interesting that so many people have asked why you would need to preserve the order of keys when in fact it would be a very useful feature. Right now I would need it to modify the configuration of some charts, they are displayed in PHP in the order they are found in the JSON which is in turn stored in a postgres text field. I would've wanted to create a plperl function to modify the chart config but it looks like I'm better off reading the config, modifying it in PHP then saving it back to the db.
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