Tsearch2 can't be checked for equality?

Hi all,

I'm trying to compare between 2 tsvector fields and I'm encountering a problem, for example:

test.com=> SELECT 1 WHERE to_tsvector('default', 'bh da') = to_tsvector('default', 'bh da');
 ?column?
----------
(0 rows)


There is another way that I can check for equality of 2 tsvector fields?

Thanks a lot in advance,
  Ben-Nes Yonatan