Rewrite FlowContext's box iterator methods to compose better.
Rewrite FlowContext's box iterator methods to compose better.

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iddle/servo,aidanhs/servo,pgonda/servo,zentner-kyle/servo,g-k/servo,wartman4404/servo,DominoTree/servo,GreenRecycleBin/servo,zentner-kyle/servo,dmarcos/servo,dhananjay92/servo,sadmansk/servo,WriterOfAlicrow/servo,mbrubeck/servo,brson/servo,nnethercote/servo,canaltinova/servo,akosel/servo,samfoo/servo,CJ8664/servo,GreenRecycleBin/servo,A-deLuna/servo,youprofit/servo,indykish/servo,rentongzhang/servo,dsandeephegde/servo,froydnj/servo,avadacatavra/servo,nerith/servo,walac/servo,luniv/servo,seanmonstar/servo,Adenilson/prototype-viewing-distance,nnethercote/servo,j3parker/servo,pcwalton/servo,michaelwu/servo,ConnorGBrewster/servo,runarberg/servo,mattnenterprise/servo,GyrosOfWar/servo,larsbergstrom/servo,juzer10/servo,pyfisch/servo,vks/servo,mrobinson/servo,mbrubeck/servo,mt2d2/servo,mdibaiee/servo,codemac/servo,pcwalton/servo,sadmansk/servo,ConnorGBrewster/servo,paulrouget/servo,thiagopnts/servo,canaltinova/servo,KiChjang/servo,vks/servo,dsandeephegde/servo,nrc/servo,pcwalton/servo,snf/servo,dati91/servo,shrenikgala/servo,saneyuki/servo,nerith/servo,wpgallih/servo,eddyb/servo,froydnj/servo,youprofit/servo,upsuper/servo,anthgur/servo,jlegendary/servo,evilpie/servo,ruud-v-a/servo,sadmansk/servo,runarberg/servo,KiChjang/servo,nnethercote/servo,splav/servo,pyfisch/servo,DominoTree/servo,GyrosOfWar/servo,boghison/servo,larsbergstrom/servo,samfoo/servo,rentongzhang/servo,echochamber/servo,evilpie/servo,A-deLuna/servo,SimonSapin/servo,CJ8664/servo,huonw/servo,froydnj/servo,walac/servo,indykish/servo,canaltinova/servo,bjwbell/servo,dvberkel/servo,samfoo/servo,avadacatavra/servo,thiagopnts/servo,notriddle/servo,metajack/servo,paulrouget/servo,vks/servo,g-k/servo,mt2d2/servo,mbrubeck/servo,pyecs/servo,KiChjang/servo,nick-thompson/servo,upsuper/servo,anthgur/servo,mukilan/servo,mt2d2/servo,ryancanhelpyou/servo,meh/servo,fiji-flo/servo,j3parker/servo,cbrewster/servo,bhearsum-bors/servo,tafia/servo,mattnenterprise/servo,KiChjang/servo,pyfisch/servo,pyecs/servo,zhangjunlei26/servo,chotchki/servo,codemac/servo,canaltinova/servo,pyfisch/servo,GreenRecycleBin/servo,hyowon/servo,luniv/servo,nnethercote/servo,cbrewster/servo,tafia/servo,juzer10/servo,rixrix/servo,zentner-kyle/servo,pyfisch/servo,dsandeephegde/servo,nrc/servo,jimberlage/servo,brendandahl/servo,michaelwu/servo,akosel/servo,bfrohs/servo,DominoTree/servo,paulrouget/servo,cbrewster/servo,metajack/servo,canaltinova/servo,youprofit/servo,larsbergstrom/servo,GreenRecycleBin/servo,AnthonyBroadCrawford/servo,indykish/servo,upsuper/servo,tafia/servo,szeged/servo,szeged/servo,huonw/servo,pcwalton/servo,g-k/servo,jimberlage/servo,aweinstock314/servo,boghison/servo,dvberkel/servo,mukilan/servo,tempbottle/servo,mbrubeck/servo,eddyb/servo,zentner-kyle/servo,emilio/servo,owaspjocur/servo,meh/servo,AnthonyBroadCrawford/servo,AnthonyBroadCrawford/servo,eddyb/servo,WriterOfAlicrow/servo,splav/servo,brson/servo,mbrubeck/servo,jdramani/servo,akosel/servo,A-deLuna/servo,wartman4404/servo,thiagopnts/servo,mattnenterprise/servo,upsuper/servo