prune the backing observing array
prune the backing observing array

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uide/ReactiveCocoa,mattpetters/ReactiveCocoa,zhenlove/ReactiveCocoa,windgo/ReactiveCocoa,ioshger0125/ReactiveCocoa,335g/ReactiveCocoa,rpowelll/ReactiveCocoa,vincentiss/ReactiveCocoa,libiao88/ReactiveCocoa,hilllinux/ReactiveCocoa,longv2go/ReactiveCocoa,tornade0913/ReactiveCocoa,tonyli508/ReactiveCocoa,bscarano/ReactiveCocoa,BlessNeo/ReactiveCocoa,KuPai32G/ReactiveCocoa,terry408911/ReactiveCocoa,bscarano/ReactiveCocoa,WEIBP/ReactiveCocoa,Ricowere/ReactiveCocoa,Adlai-Holler/ReactiveCocoa,tonyarnold/ReactiveCocoa,SuPair/ReactiveCocoa,sugar2010/ReactiveCocoa,fhchina/ReactiveCocoa,bencochran/ReactiveCocoa,koamac/ReactiveCocoa,taylormoonxu/ReactiveCocoa,stevielu/ReactiveCocoa,smilypeda/ReactiveCocoa,itschaitanya/ReactiveCocoa,j364960953/ReactiveCocoa,monkeydbobo/ReactiveCocoa,icepy/ReactiveCocoa,sujeking/ReactiveCocoa,200895045/ReactiveCocoa,itschaitanya/ReactiveCocoa,add715/ReactiveCocoa,hoanganh6491/ReactiveCocoa,beni55/ReactiveCocoa,zhigang1992/ReactiveCocoa,cnbin/ReactiveCocoa,Ray0218/ReactiveCocoa,wpstarnice/ReactiveCocoa,ohwutup/ReactiveCocoa,200895045/ReactiveCocoa,ztchena/ReactiveCocoa,cnbin/ReactiveCocoa,jianwoo/ReactiveCocoa,AndyZhaoHe/ReactiveCocoa,jaylib/ReactiveCocoa,on99/ReactiveCocoa,takeshineshiro/ReactiveCocoa,zhaoguohui/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,chao95957/ReactiveCocoa,almassapargali/ReactiveCocoa,DongDongDongDong/ReactiveCocoa,mxxiv/ReactiveCocoa,LHDsimon/ReactiveCocoa,JohnJin007/ReactiveCocoa,jaylib/ReactiveCocoa,jianwoo/ReactiveCocoa,yaoxiaoyong/ReactiveCocoa,tipbit/ReactiveCocoa,KuPai32G/ReactiveCocoa,taylormoonxu/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,clg0118/ReactiveCocoa,icepy/ReactiveCocoa,esttorhe/ReactiveCocoa,andersio/ReactiveCocoa,Khan/ReactiveCocoa,dachaoisme/ReactiveCocoa,SuPair/ReactiveCocoa,buildo/ReactiveCocoa,eliperkins/ReactiveCocoa,valleyman86/ReactiveCocoa,tiger8888/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,Ricowere/ReactiveCocoa,tiger8888/ReactiveCocoa,eliperkins/ReactiveCocoa,huiping192/ReactiveCocoa,Remitly/ReactiveCocoa,nikita-leonov/ReactiveCocoa,hbucius/ReactiveCocoa,kevin-zqw/ReactiveCocoa,mattpetters/ReactiveCocoa,llb1119/test,Pingco/ReactiveCocoa,shuxiashusheng/ReactiveCocoa,esttorhe/ReactiveCocoa,jackywpy/ReactiveCocoa,Eveian/ReactiveCocoa,natestedman/ReactiveCocoa,yangyangluoluo/ReactiveCocoa,Farteen/ReactiveCocoa,dz1111/ReactiveCocoa,ikesyo/ReactiveCocoa,AllanChen/ReactiveCocoa,itschaitanya/ReactiveCocoa,nikita-leonov/ReactiveCocoa,kaylio/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,sugar2010/ReactiveCocoa,nickcheng/ReactiveCocoa,dullgrass/ReactiveCocoa,BrooksWon/ReactiveCocoa,leichunfeng/ReactiveCocoa,goodheart/ReactiveCocoa,DreamHill/ReactiveCocoa,chieryw/ReactiveCocoa,swizzlr/ReactiveCocoa,tonyli508/ReactiveCocoa,stevielu/ReactiveCocoa,Ethan89/ReactiveCocoa,tornade0913/ReactiveCocoa,huiping192/ReactiveCocoa,BlessNeo/ReactiveCocoa,wpstarnice/ReactiveCocoa,on99/ReactiveCocoa,ailyanlu/ReactiveCocoa,SanChain/ReactiveCocoa,OnTheWay1988/ReactiveCocoa,leelili/ReactiveCocoa,emodeqidao/ReactiveCocoa,yizzuide/ReactiveCocoa,tzongw/ReactiveCocoa,ShawnLeee/ReactiveCocoa,walkingsmarts/ReactiveCocoa,fhchina/ReactiveCocoa,zhiwen1024/ReactiveCocoa,cstars135/ReactiveCocoa,valleyman86/ReactiveCocoa,pzw224/ReactiveCocoa,mattpetters/ReactiveCocoa,howandhao/ReactiveCocoa,jrmiddle/ReactiveCocoa,yaoxiaoyong/ReactiveCocoa,add715/ReactiveCocoa,Ethan89/ReactiveCocoa,longv2go/ReactiveCocoa,dskatz22/ReactiveCocoa,fhchina/ReactiveCocoa,paulyoung/ReactiveCocoa,gabemdev/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,xiaobing2007/ReactiveCocoa,kiurentu/ReactiveCocoa,Remitly/ReactiveCocoa,xumaolin/ReactiveCocoa,smilypeda/ReactiveCocoa,imkerberos/ReactiveCocoa,Ricowere/ReactiveCocoa,tipbit/ReactiveCocoa,swizzlr/ReactiveCocoa,kaylio/ReactiveCocoa,natan/ReactiveCocoa,Ethan89/ReactiveCocoa,vincentiss/ReactiveCocoa,Pingco/ReactiveCocoa,Pikdays/ReactiveCocoa,DreamHill/ReactiveCocoa,Ricowere/ReactiveCocoa,DreamHill/ReactiveCocoa,hbucius/ReactiveCocoa,zhukaixy/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,FelixYin66/ReactiveCocoa,monkeydbobo/ReactiveCocoa,richeterre/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,koamac/ReactiveCocoa,sugar2010/ReactiveCocoa,hilllinux/ReactiveCocoa,tiger8888/ReactiveCocoa,shuxiashusheng/ReactiveCocoa,CQXfly/ReactiveCocoa,jeelun/ReactiveCocoa,zhaoguohui/ReactiveCocoa,sandyway/ReactiveCocoa,mtxs007/ReactiveCocoa,sandyway/ReactiveCocoa,nickcheng/ReactiveCocoa,smilypeda/ReactiveCocoa,jam891/ReactiveCocoa,ceekayel/ReactiveCocoa,zhenlove/ReactiveCocoa,SmartEncounter/ReactiveCocoa,dachaoisme/ReactiveCocoa,ceekayel/ReactiveCocoa,llb1119/test,OneSmallTree/ReactiveCocoa,SanChain/ReactiveCocoa,zxq3220122/ReactiveCocoa,shaohung001/ReactiveCocoa,ericzhou2008/ReactiveCocoa,gengjf/ReactiveCocoa,msdgwzhy6/ReactiveCocoa,JackLian/ReactiveCocoa,isghe/ReactiveCocoa,GuitarPlayer-Ma/ReactiveCocoa,tzongw/ReactiveCocoa,qq644531343/ReactiveCocoa,tzongw/ReactiveCocoa,j364960953/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,DongDongDongDong/ReactiveCocoa,JackLian/ReactiveCocoa,buildo/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,ztchena/ReactiveCocoa,loupman/ReactiveCocoa,loupman/ReactiveCocoa,goodheart/ReactiveCocoa,alvinvarghese/ReactiveCocoa,chao95957/ReactiveCocoa,hilllinux/ReactiveCocoa,200895045/ReactiveCocoa,bencochran/ReactiveCocoa,SanChain/ReactiveCocoa,dullgrass/ReactiveCocoa,fanghao085/ReactiveCocoa,ioshger0125/ReactiveCocoa,huiping192/ReactiveCocoa,LHDsimon/ReactiveCocoa,Juraldinio/ReactiveCocoa,sujeking/ReactiveCocoa,BrooksWon/ReactiveCocoa,lixar/ReactiveCocoa,yonekawa/ReactiveCocoa,natan/ReactiveCocoa,terry408911/ReactiveCocoa,ztchena/ReactiveCocoa,xiaoliyang/ReactiveCocoa,wangqi211/ReactiveCocoa,AndyZhaoHe/ReactiveCocoa,Ray0218/ReactiveCocoa,JackLian/ReactiveCocoa,CQXfly/ReactiveCocoa,eyu1988/ReactiveCocoa,dskatz22/ReactiveCocoa,paulyoung/ReactiveCocoa,JohnJin007/ReactiveCocoa,chieryw/ReactiveCocoa,howandhao/ReactiveCocoa,goodheart/ReactiveCocoa,BlessNeo/ReactiveCocoa,fanghao085/ReactiveCocoa,howandhao/ReactiveCocoa,brasbug/ReactiveCocoa,SmartEncounter/ReactiveCocoa,cstars135/ReactiveCocoa,Rupert-RR/ReactiveCocoa,brasbug/ReactiveCocoa,bscarano/ReactiveCocoa,zxq3220122/ReactiveCocoa,windgo/ReactiveCocoa,Ray0218/ReactiveCocoa,lixar/ReactiveCocoa,AlanJN/ReactiveCocoa,hbucius/ReactiveCocoa,zhigang1992/ReactiveCocoa,dz1111/ReactiveCocoa,dz1111/ReactiveCocoa,Pingco/ReactiveCocoa,jackywpy/ReactiveCocoa,GuitarPlayer-Ma/ReactiveCocoa,walkingsmarts/ReactiveCocoa,yytong/ReactiveCocoa,zzzworm/ReactiveCocoa,j364960953/ReactiveCocoa,zzqiltw/ReactiveCocoa,mxxiv/ReactiveCocoa,taylormoonxu/ReactiveCocoa,ailyanlu/ReactiveCocoa,leelili/ReactiveCocoa,towik/ReactiveCocoa,brightcove/ReactiveCocoa,xumaolin/ReactiveCocoa,Khan/ReactiveCocoa,AlanJN/ReactiveCocoa,libiao88/ReactiveCocoa,luerhouhou/ReactiveCocoa,cstars135/ReactiveCocoa,SuPair/ReactiveCocoa,monkeydbobo/ReactiveCocoa,zhigang1992/ReactiveCocoa,zzqiltw/ReactiveCocoa,DongDongDongDong/ReactiveCocoa,kaylio/ReactiveCocoa,chao95957/ReactiveCocoa,BrooksWon/ReactiveCocoa,windgo/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,esttorhe/ReactiveCocoa,chieryw/ReactiveCocoa,jackywpy/ReactiveCocoa,jam891/ReactiveCocoa,terry408911/ReactiveCocoa,cogddo/ReactiveCocoa,kevin-zqw/ReactiveCocoa,wpstarnice/ReactiveCocoa,Rupert-RR/ReactiveCocoa,KJin99/ReactiveCocoa,Juraldinio/ReactiveCocoa,buildo/ReactiveCocoa,shaohung001/ReactiveCocoa,KJin99/ReactiveCocoa