I am using the search api to search for questions that are tagged with "tags" and not with "tags". However I have noticed that searching for tags is an OR search.

The questions search for tags is an AND search. Why the difference?

e.g. AND Search
http://api.stackoverflow.com/0.9/questions?tagged=php;mysql
OR Search
http://api.stackoverflow.com/0.9/search?tagged=php;mysql

Also would it be possible to switch the searching type from OR to AND on the search api by an option?