[test] Data: Add tests exercising Sequence-based init and append
[test] Data: Add tests exercising Sequence-based init and append

glessard/swift,benlangmuir/swift,allevato/swift,rudkx/swift,parkera/swift,nathawes/swift,tkremenek/swift,apple/swift,aschwaighofer/swift,nathawes/swift,nathawes/swift,benlangmuir/swift,ahoppen/swift,tkremenek/swift,airspeedswift/swift,harlanhaskins/swift,hooman/swift,allevato/swift,ahoppen/swift,nathawes/swift,glessard/swift,atrick/swift,nathawes/swift,stephentyrone/swift,airspeedswift/swift,stephentyrone/swift,ahoppen/swift,apple/swift,jckarter/swift,CodaFi/swift,nathawes/swift,gregomni/swift,hooman/swift,roambotics/swift,airspeedswift/swift,parkera/swift,rudkx/swift,parkera/swift,JGiola/swift,aschwaighofer/swift,atrick/swift,airspeedswift/swift,apple/swift,harlanhaskins/swift,atrick/swift,aschwaighofer/swift,gregomni/swift,harlanhaskins/swift,hooman/swift,airspeedswift/swift,jckarter/swift,airspeedswift/swift,hooman/swift,xwu/swift,stephentyrone/swift,xwu/swift,gregomni/swift,hooman/swift,gregomni/swift,xwu/swift,stephentyrone/swift,aschwaighofer/swift,jmgc/swift,parkera/swift,jmgc/swift,JGiola/swift,tkremenek/swift,jckarter/swift,harlanhaskins/swift,allevato/swift,aschwaighofer/swift,aschwaighofer/swift,harlanhaskins/swift,parkera/swift,glessard/swift,stephentyrone/swift,ahoppen/swift,stephentyrone/swift,rudkx/swift,parkera/swift,JGiola/swift,tkremenek/swift,tkremenek/swift,atrick/swift,atrick/swift,JGiola/swift,airspeedswift/swift,parkera/swift,CodaFi/swift,rudkx/swift,jmgc/swift,jmgc/swift,ahoppen/swift,benlangmuir/swift,jmgc/swift,xwu/swift,glessard/swift,CodaFi/swift,roambotics/swift,glessard/swift,tkremenek/swift,harlanhaskins/swift,jmgc/swift,allevato/swift,nathawes/swift,roambotics/swift,CodaFi/swift,aschwaighofer/swift,atrick/swift,hooman/swift,apple/swift,harlanhaskins/swift,xwu/swift,rudkx/swift,glessard/swift,hooman/swift,JGiola/swift,stephentyrone/swift,CodaFi/swift,CodaFi/swift,allevato/swift,parkera/swift,benlangmuir/swift,allevato/swift,jckarter/swift,jmgc/swift,apple/swift,JGiola/swift,jckarter/swift,benlangmuir/swift,apple/swift,roambotics/swift,xwu/swift,tkremenek/swift,benlangmuir/swift,xwu/swift,gregomni/swift,ahoppen/swift,roambotics/swift,jckarter/swift,rudkx/swift,gregomni/swift,jckarter/swift,CodaFi/swift,roambotics/swift,allevato/swift