Fix AttributeSet#set_default
Fix AttributeSet#set_default

  * I broke it while resolving merge conflicts

mallikarjunayaddala/virtus,JustMikey/virtus,dslh/virtus,faucct/virtus,reevoo/virtus,hapiben/virtus,XescuGC/virtus,macressler/virtus,artemeff/virtus,baojjeu/virtus,solnic/virtus