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jsonb_set_lax() is the same as jsonb_set, except that it takes and extra argument that specifies what to do if the value argument is NULL. The default is 'use_json_null'. Other possibilities are 'raise_exception', 'return_target' and 'delete_key', all these behaviours having been suggested as reasonable by various users. Discussion: https://postgr.es/m/375873e2-c957-3a8d-64f9-26c43c2b16e7@2ndQuadrant.com Reviewed by: Pavel Stehule