It gets confused by 0 maximum because it's falsy, like undefined.
Created attachment 309616 [details] patch
Comment on attachment 309616 [details] patch r=me.
Comment on attachment 309616 [details] patch Clearing flags on attachment: 309616 Committed r216598: <http://trac.webkit.org/changeset/216598>
All reviewed patches have been landed. Closing bug.