WI.RadioButtonNavigationItem.prototype.tabbable should return a boolean, not 0 or -1.
<rdar://problem/62445067>
Created attachment 397671 [details] Patch
Comment on attachment 397671 [details] Patch rs=me
Committed r260761: <https://trac.webkit.org/changeset/260761> All reviewed patches have been landed. Closing bug and clearing flags on attachment 397671 [details].