On fre, 2012-05-04 at 15:59 -0400, Robert Haas wrote:
> > Can we at least have the xxx_to_json() functions try cast to json
> first
> > and fall back to text if the cast fails.
> I think the idea that you can involve the casting machinery in this is
> misguided.  sometextval::json has got to mean that sometextval is
> expected to be in the form of a syntactically correct JSON value - and
> NOT that we wrap it in a JSON string.

I think it's only wrong if you try casting first and fall back to text.
Otherwise it could work, if the set of all json casts is defined

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