Should phraseto_tsquery('simple', 'blue blue') @@ to_tsvector('simple', 'blue') be true ?

Hi,

I wanted to test if phraseto_tsquery(), new with 9.6 could be used for
matching consecutive words but it won't work for us if it cannot handle
consecutive *duplicate* words.

For example, the following returns true: select
phraseto_tsquery('simple', 'blue blue') @@ to_tsvector('simple', 'blue');

Is this expected ?

Thanks,
Jean-Pierre Pelletier