array_accum() and quoted content

Some time ago, I found the aggregate function array_accum() listed on
the PostgreSQL web site on a page similar to
http://www.postgresql.org/docs/8.2/static/xaggr.html , and implemented
it in a database that hasn't seen much use. More recently, for a client,
I again used the function but I'm running into some inconsistencies
within a select query in which I'm using the aggregate. The problem is
that sometimes the data contained in the array is quoted, and other
times it isn't, all within the same query results. My returned data may
appear like this:

accumed_column
============
{"test 1","test 2","test 3"}
{test4,test5,test6}

The only difference I can see is that the quotes don't appear when the
values returned don't contain white space, and do when white space is
present. Is there any way to force consistency? My PHP code currently is
expecting quoted strings to be returned.

Thank you,
Raymond