array_to_string bug?

Folks,

Here's expected behavior:

davidfetter@postgres=# SELECT array(values(1),(null));?column? 
──────────{1,NULL}
(1 row)

The next one is just plain unexpected.  Either it's a bug, or it needs
more documentation in the function description in the docs, \df+
output, etc.

davidfetter@postgres=# SELECT array_to_string(array(values(1),(null)),'');array_to_string 
─────────────────1
(1 row)

I would have expected it to come out as NULL.

What say?

Cheers,
David.
-- 
David Fetter <david@fetter.org> http://fetter.org/
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