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Does the JSON type still have a set of use cases as well or is it just obsolete now? If I was writing large quantities of json documents to a table, and I didn't need tag indexing or targeted updating, would using the JSON type be faster than JSONB?

Probably the most important difference is that the old JSON types preserves whitespace and attribute ordering, whereas the new one doesn't. If you don't care about those, the old one is also slightly smaller on disk - but I would say not worth it based on the simple fact that you might want to search it in the future some time...

I think this is largely a new internal storage format that is more performant.

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