Re: BUG #19735: `jsonb_object_agg_unique_strict` drops a JSONB `null` value as if it were SQL NULL

Hi Dmitry,

I agree the docs should say which nulls are meant.

I am not sure it was intended though. The jsonb array functions keep
a JSON null, and JSON_OBJECT() drops the key only with RETURNING
jsonb:

SELECT JSON_OBJECT('a': 'null'::jsonb ABSENT ON NULL RETURNING jsonb),
JSON_OBJECT('a': 'null'::jsonb ABSENT ON NULL RETURNING json);
{} | {"a" : null}

Skipping only SQL NULLs needs no check per element in jsonb, the
caller knows which values it skipped. So I lean to SQL NULL only for
both. I would like a committer to pick, and the doc patch is attached.

Thanks,
Shihao