Add a note about Boolean type (closes #234)
Add a note about Boolean type (closes #234)

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