I expected a naive search for a term in the search box on a SE site would look in tag names as well as other text. It appears to ignore the tags during the search.
Here's a sample of a search for all posts tagged with an uncommon tag (e.g. not in the top 40):
I get 13 results.
Here's a sample of a search for all posts containing the same term:
I get only 4 results.
I expected the second query to get at least the initial 13 results of the first query, plus possibly more. I perceive this as a bug, because I think a newbie would not expect this behaviour.