favor a perfect match

wcs/sql.py

@@ -1720,7 +1720,7 @@ with
             select w,
                 coalesce(perfect.token, tsquery_agg_or(plainto_tsquery(token) order by token <-> w desc), plainto_tsquery(w)) tokens
             from tokenized
-            left join wcs_search_tokens perfect on token = plainto_tsquery(w)
+            left join wcs_search_tokens perfect on token = plainto_tsquery(w)::text
             left join wcs_search_tokens on token % w and w not similar to '%[0-9]{2,}%'
             group by w)
 select tsquery_agg_and(tokens) from super_tokenized;