Why doesn't HasScrollHandlers extend HasHandlers?

This feels like a dumb question. Is this an oversight, or is there a
reason why HasScrollHandlers is the only Has.*Handlers interface that
does not extend HasHandlers?

http://google-web-toolkit.googlecode.com/svn/javadoc/2.3/com/google/gwt/event/dom/client/HasScrollHandlers.html
http://www.google.com/codesearch#A1edwVHBClQ/user/src/com/google/gwt/event/dom/client/HasScrollHandlers.java

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