Add Attribute#typecast_to_primitive spec
Add Attribute#typecast_to_primitive spec

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