On 11/20/2013 01:36 PM, Tom Lane wrote:

You'd have to make the data self-identifying (which I think was the plan
already), and ensure that *every* function taking "json" could cope with
both formats on input.  The typmod could only be expected to be enforced
when storing or explicitly casting to one subformat, much like operations
on "numeric" pay little attention to the original precision/scale if any.

I agree that this solution isn't terribly workable, mainly because it'd
break any third-party C functions that take json today.


Yeah, I had come to this conclusion. I don't think we can bolt on typmods after the event.

I don't think having a separate "jsonb" type will be a tragedy.

I'm already planning on overloading the existing json functions and operators.



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