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This essentially reverts c2d93c3 except tests. The problem with
c2d93c3 was that it only changed the casting behavior for types
with typmod, and had coding issues noted in the post-commit review.
This commit changes coerceJsonFuncExpr() to use assignment-level casts
instead of explicit casts to coerce the result of JSON constructor
functions to the specified or the default RETURNING type. Using
assignment-level casts fixes the problem that using explicit casts was
leading to the wrong typmod / length coercion behavior -- truncating
results longer than the specified length instead of erroring out --
which c2d93c3 aimed to solve.
That restricts the set of allowed target types to string types, the
same set that's currently allowed.
Discussion: https://postgr.es/m/202406291824.reofujy7xdj3@alvherre.pgsql
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