Why are json <=> jsonb casts marked as explicit-only?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: pgsql-hackers(at)postgreSQL(dot)org
Subject: Why are json <=> jsonb casts marked as explicit-only?
Date: 2015-03-02 21:26:22
Message-ID: 11562.1425331582@sss.pgh.pa.us
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Surely they should be assignment level, if not implicit. I don't
really see why I should have to write a cast to assign a json
expression result into a jsonb column, in particular.

regards, tom lane

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