font size override and grace notes

[Matt Cary]

> I'm not top posting.

Sorry if this is a dup. I did a quick web search, and code.google.com 
search, and didn't see anything close.

The following doesn't do what I'd expect. The grace note has the large 
font size; I'd expect it to be its regular size (ie, small). Let me know if you
need any more information or context.

\relative c' {
 \override NoteHead #'font-size = #1
 g
 \revert NoteHead #'font-size
 \slashedGrace a16( b8)
}

\version "2.16.0"