Fix race conditions in takeUntilReplacement()
Fix race conditions in takeUntilReplacement()

sujeking/ReactiveCocoa,isghe/ReactiveCocoa,zzzworm/ReactiveCocoa,200895045/ReactiveCocoa,taylormoonxu/ReactiveCocoa,tornade0913/ReactiveCocoa,JackLian/ReactiveCocoa,beni55/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,mxxiv/ReactiveCocoa,jaylib/ReactiveCocoa,yangyangluoluo/ReactiveCocoa,tornade0913/ReactiveCocoa,cogddo/ReactiveCocoa,libiao88/ReactiveCocoa,loupman/ReactiveCocoa,kevin-zqw/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,SuPair/ReactiveCocoa,richeterre/ReactiveCocoa,victorlin/ReactiveCocoa,JackLian/ReactiveCocoa,CQXfly/ReactiveCocoa,yytong/ReactiveCocoa,qq644531343/ReactiveCocoa,OnTheWay1988/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,jackywpy/ReactiveCocoa,shuxiashusheng/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,dullgrass/ReactiveCocoa,jeelun/ReactiveCocoa,almassapargali/ReactiveCocoa,natan/ReactiveCocoa,lixar/ReactiveCocoa,goodheart/ReactiveCocoa,BlessNeo/ReactiveCocoa,Liquidsoul/ReactiveCocoa,msdgwzhy6/ReactiveCocoa,walkingsmarts/ReactiveCocoa,KJin99/ReactiveCocoa,mattpetters/ReactiveCocoa,goodheart/ReactiveCocoa,huiping192/ReactiveCocoa,LHDsimon/ReactiveCocoa,chao95957/ReactiveCocoa,mattpetters/ReactiveCocoa,Farteen/ReactiveCocoa,sdhzwm/ReactiveCocoa,goodheart/ReactiveCocoa,natan/ReactiveCocoa,stupidfive/ReactiveCocoa,liufeigit/ReactiveCocoa,kevin-zqw/ReactiveCocoa,clg0118/ReactiveCocoa,KJin99/ReactiveCocoa,rpowelll/ReactiveCocoa,zxq3220122/ReactiveCocoa,yonekawa/ReactiveCocoa,cstars135/ReactiveCocoa,imkerberos/ReactiveCocoa,liufeigit/ReactiveCocoa,LHDsimon/ReactiveCocoa,Khan/ReactiveCocoa,ShawnLeee/ReactiveCocoa,shaohung001/ReactiveCocoa,towik/ReactiveCocoa,brasbug/ReactiveCocoa,natestedman/ReactiveCocoa,tonyarnold/ReactiveCocoa,fanghao085/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,ohwutup/ReactiveCocoa,vincentiss/ReactiveCocoa,jaylib/ReactiveCocoa,gengjf/ReactiveCocoa,BrooksWon/ReactiveCocoa,nickcheng/ReactiveCocoa,eyu1988/ReactiveCocoa,CQXfly/ReactiveCocoa,Khan/ReactiveCocoa,llb1119/test,hoanganh6491/ReactiveCocoa,andersio/ReactiveCocoa,j364960953/ReactiveCocoa,zhiwen1024/ReactiveCocoa,alvinvarghese/ReactiveCocoa,sdhzwm/ReactiveCocoa,GuitarPlayer-Ma/ReactiveCocoa,liufeigit/ReactiveCocoa,fanghao085/ReactiveCocoa,mtxs007/ReactiveCocoa,ceekayel/ReactiveCocoa,buildo/ReactiveCocoa,Liquidsoul/ReactiveCocoa,hoanganh6491/ReactiveCocoa,GuitarPlayer-Ma/ReactiveCocoa,taylormoonxu/ReactiveCocoa,DongDongDongDong/ReactiveCocoa,terry408911/ReactiveCocoa,emodeqidao/ReactiveCocoa,dskatz22/ReactiveCocoa,chieryw/ReactiveCocoa,takeshineshiro/ReactiveCocoa,hilllinux/ReactiveCocoa,hj3938/ReactiveCocoa,stevielu/ReactiveCocoa,ShawnLeee/ReactiveCocoa,bscarano/ReactiveCocoa,xiaoliyang/ReactiveCocoa,andersio/ReactiveCocoa,smilypeda/ReactiveCocoa,leichunfeng/ReactiveCocoa,fhchina/ReactiveCocoa,Ray0218/ReactiveCocoa,smilypeda/ReactiveCocoa,zxq3220122/ReactiveCocoa,AlanJN/ReactiveCocoa,jaylib/ReactiveCocoa,PSPDFKit-labs/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,buildo/ReactiveCocoa,xumaolin/ReactiveCocoa,ddc391565320/ReactiveCocoa,itschaitanya/ReactiveCocoa,esttorhe/ReactiveCocoa,wangqi211/ReactiveCocoa,wpstarnice/ReactiveCocoa,wangqi211/ReactiveCocoa,dskatz22/ReactiveCocoa,ioshger0125/ReactiveCocoa,xiaobing2007/ReactiveCocoa,sandyway/ReactiveCocoa,jam891/ReactiveCocoa,natestedman/ReactiveCocoa,ikesyo/ReactiveCocoa,SanChain/ReactiveCocoa,wangqi211/ReactiveCocoa,add715/ReactiveCocoa,DreamHill/ReactiveCocoa,Khan/ReactiveCocoa,ohwutup/ReactiveCocoa,hbucius/ReactiveCocoa,ztchena/ReactiveCocoa,qq644531343/ReactiveCocoa,j364960953/ReactiveCocoa,zhaoguohui/ReactiveCocoa,richeterre/ReactiveCocoa,ztchena/ReactiveCocoa,juliangrosshauser/ReactiveCocoa,yoichitgy/ReactiveCocoa,ddc391565320/ReactiveCocoa,FelixYin66/ReactiveCocoa,walkingsmarts/ReactiveCocoa,AndyZhaoHe/ReactiveCocoa,towik/ReactiveCocoa,buildo/ReactiveCocoa,ShawnLeee/ReactiveCocoa,Pingco/ReactiveCocoa,ceekayel/ReactiveCocoa,mtxs007/ReactiveCocoa,natestedman/ReactiveCocoa,loupman/ReactiveCocoa,CCOOOOLL/ReactiveCocoa,leelili/ReactiveCocoa,xumaolin/ReactiveCocoa,xulibao/ReactiveCocoa,shaohung001/ReactiveCocoa,shuxiashusheng/ReactiveCocoa,tzongw/ReactiveCocoa,SuPair/ReactiveCocoa,cogddo/ReactiveCocoa,add715/ReactiveCocoa,xiaoliyang/ReactiveCocoa,nikita-leonov/ReactiveCocoa,howandhao/ReactiveCocoa,shuxiashusheng/ReactiveCocoa,tonyli508/ReactiveCocoa,Liquidsoul/ReactiveCocoa,towik/ReactiveCocoa,Juraldinio/ReactiveCocoa,takeshineshiro/ReactiveCocoa,CCOOOOLL/ReactiveCocoa,msdgwzhy6/ReactiveCocoa,DongDongDongDong/ReactiveCocoa,OnTheWay1988/ReactiveCocoa,bscarano/ReactiveCocoa,nikita-leonov/ReactiveCocoa,stupidfive/ReactiveCocoa,natan/ReactiveCocoa,zhenlove/ReactiveCocoa,OneSmallTree/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,dz1111/ReactiveCocoa,tonyli508/ReactiveCocoa,icepy/ReactiveCocoa,chao95957/ReactiveCocoa,clg0118/ReactiveCocoa,stevielu/ReactiveCocoa,zzqiltw/ReactiveCocoa,terry408911/ReactiveCocoa,dullgrass/ReactiveCocoa,yonekawa/ReactiveCocoa,Eveian/ReactiveCocoa,OneSmallTree/ReactiveCocoa,ohwutup/ReactiveCocoa,brasbug/ReactiveCocoa,DongDongDongDong/ReactiveCocoa,Farteen/ReactiveCocoa,victorlin/ReactiveCocoa,cstars135/ReactiveCocoa,nikita-leonov/ReactiveCocoa,xiaobing2007/ReactiveCocoa,FelixYin66/ReactiveCocoa,GuitarPlayer-Ma/ReactiveCocoa,leichunfeng/ReactiveCocoa,tiger8888/ReactiveCocoa,zzqiltw/ReactiveCocoa,zxq3220122/ReactiveCocoa,xulibao/ReactiveCocoa,zhenlove/ReactiveCocoa,loupman/ReactiveCocoa,xiaobing2007/ReactiveCocoa,valleyman86/ReactiveCocoa,valleyman86/ReactiveCocoa,walkingsmarts/ReactiveCocoa,JohnJin007/ReactiveCocoa,WEIBP/ReactiveCocoa,lixar/ReactiveCocoa,juliangrosshauser/ReactiveCocoa,rpowelll/ReactiveCocoa,yaoxiaoyong/ReactiveCocoa,yoichitgy/ReactiveCocoa,beni55/ReactiveCocoa,emodeqidao/ReactiveCocoa,yoichitgy/ReactiveCocoa,tonyli508/ReactiveCocoa,dskatz22/ReactiveCocoa,sandyway/ReactiveCocoa,sugar2010/ReactiveCocoa,llb1119/test,sugar2010/ReactiveCocoa,KuPai32G/ReactiveCocoa,paulyoung/ReactiveCocoa,hbucius/ReactiveCocoa,zhukaixy/ReactiveCocoa,pzw224/ReactiveCocoa,Juraldinio/ReactiveCocoa,Ray0218/ReactiveCocoa,longv2go/ReactiveCocoa,yizzuide/ReactiveCocoa,shaohung001/ReactiveCocoa,jackywpy/ReactiveCocoa,eyu1988/ReactiveCocoa,longv2go/ReactiveCocoa,stupidfive/ReactiveCocoa,almassapargali/ReactiveCocoa,jrmiddle/ReactiveCocoa,jrmiddle/ReactiveCocoa,JackLian/ReactiveCocoa,OnTheWay1988/ReactiveCocoa,yaoxiaoyong/ReactiveCocoa,tiger8888/ReactiveCocoa,WEIBP/ReactiveCocoa,DreamHill/ReactiveCocoa,luerhouhou/ReactiveCocoa,j364960953/ReactiveCocoa,SuPair/ReactiveCocoa,WEIBP/ReactiveCocoa,zhigang1992/ReactiveCocoa,zhaoguohui/ReactiveCocoa,dz1111/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,zzqiltw/ReactiveCocoa,mattpetters/ReactiveCocoa,leelili/ReactiveCocoa,Rupert-RR/ReactiveCocoa,calebd/ReactiveCocoa,kaylio/ReactiveCocoa,luerhouhou/ReactiveCocoa,kevin-zqw/ReactiveCocoa,windgo/ReactiveCocoa,wpstarnice/ReactiveCocoa,Farteen/ReactiveCocoa,isghe/ReactiveCocoa,richeterre/ReactiveCocoa,huiping192/ReactiveCocoa,almassapargali/ReactiveCocoa,LHDsimon/ReactiveCocoa,yytong/ReactiveCocoa,ericzhou2008/ReactiveCocoa,msdgwzhy6/ReactiveCocoa,Ethan89/ReactiveCocoa,tornade0913/ReactiveCocoa,xumaolin/ReactiveCocoa,jaylib/ReactiveCocoa,jam891/ReactiveCocoa,yizzuide/ReactiveCocoa,Ethan89/ReactiveCocoa,ztchena/ReactiveCocoa,DreamHill/ReactiveCocoa,dachaoisme/ReactiveCocoa,Eveian/ReactiveCocoa,qq644531343/ReactiveCocoa,ReactiveCocoa/ReactiveSwift,AlanJN/ReactiveCocoa,libiao88/ReactiveCocoa,hbucius/ReactiveCocoa,victorlin/ReactiveCocoa,gengjf/ReactiveCocoa,Ricowere/ReactiveCocoa,taylormoonxu/ReactiveCocoa,imkerberos/ReactiveCocoa,add715/ReactiveCocoa,BlessNeo/ReactiveCocoa,paulyoung/ReactiveCocoa,pzw224/ReactiveCocoa,nickcheng/ReactiveCocoa,hj3938/ReactiveCocoa,chao95957/ReactiveCocoa,RuiAAPeres/ReactiveCocoa,ikesyo/ReactiveCocoa,wpstarnice/ReactiveCocoa,bensonday/ReactiveCocoa,JohnJin007/ReactiveCocoa,tonyarnold/ReactiveCocoa,zhukaixy/ReactiveCocoa,bscarano/ReactiveCocoa,bensonday/ReactiveCocoa,CQXfly/ReactiveCocoa,AndyZhaoHe/ReactiveCocoa,calebd/ReactiveCocoa,mxxiv/ReactiveCocoa,itschaitanya/ReactiveCocoa,Rupert-RR/ReactiveCocoa,KuPai32G/ReactiveCocoa,itschaitanya/ReactiveCocoa,alvinvarghese/ReactiveCocoa,dullgrass/ReactiveCocoa,tiger8888/ReactiveCocoa,FelixYin66/ReactiveCocoa,JohnJin007/ReactiveCocoa,nickcheng/ReactiveCocoa,howandhao/ReactiveCocoa,zzzworm/ReactiveCocoa,fhchina/ReactiveCocoa,dz1111/ReactiveCocoa,mxxiv/ReactiveCocoa,sandyway/ReactiveCocoa,clg0118/ReactiveCocoa,yytong/ReactiveCocoa,cnbin/ReactiveCocoa,pzw224/ReactiveCocoa,KJin99/ReactiveCocoa,kiurentu/ReactiveCocoa,chieryw/ReactiveCocoa,zzzworm/ReactiveCocoa,vincentiss/ReactiveCocoa,zhenlove/ReactiveCocoa,mtxs007/ReactiveCocoa,cogddo/ReactiveCocoa,hj3938/ReactiveCocoa,fanghao085/ReactiveCocoa,jam891/ReactiveCocoa,kiurentu/ReactiveCocoa,yaoxiaoyong/ReactiveCocoa,Pingco/ReactiveCocoa,gengjf/ReactiveCocoa,AlanJN/ReactiveCocoa,on99/ReactiveCocoa,kaylio/ReactiveCocoa,leelili/ReactiveCocoa,tonyarnold/ReactiveCocoa,libiao88/ReactiveCocoa,longv2go/ReactiveCocoa,zhigang1992/ReactiveCocoa,luerhouhou/ReactiveCocoa,monkeydbobo/ReactiveCocoa,huiping192/ReactiveCocoa,monkeydbobo/ReactiveCocoa,dachaoisme/ReactiveCocoa,calebd/ReactiveCocoa,jsslai/ReactiveCocoa,nickcheng/ReactiveCocoa,eyu1988/ReactiveCocoa,imkerberos/ReactiveCocoa,esttorhe/ReactiveCocoa,yonekawa/ReactiveCocoa,KuPai32G/ReactiveCocoa,Ricowere/ReactiveCocoa,esttorhe/ReactiveCocoa,alvinvarghese/ReactiveCocoa,ioshger0125/ReactiveCocoa,200895045/ReactiveCocoa,yangshengchaoios/ReactiveCocoa,Ethan89/ReactiveCocoa,Juraldinio/ReactiveCocoa,beni55/ReactiveCocoa,monkeydbobo/ReactiveCocoa,AndyZhaoHe/ReactiveCocoa,kiurentu/ReactiveCocoa,zhiwen1024/ReactiveCocoa,llb1119/test,yangyangluoluo/ReactiveCocoa,fhchina/ReactiveCocoa,cstars135/ReactiveCocoa,jackywpy/ReactiveCocoa,chieryw/ReactiveCocoa,andersio/ReactiveCocoa,xiaoliyang/ReactiveCocoa,BrooksWon/ReactiveCocoa,SanChain/ReactiveCocoa,xulibao/ReactiveCocoa,howandhao/ReactiveCocoa,kaylio/ReactiveCocoa,ericzhou2008/ReactiveCocoa,Rupert-RR/ReactiveCocoa,jsslai/ReactiveCocoa,zhaoguohui/ReactiveCocoa,ddc391565320/ReactiveCocoa,stevielu/ReactiveCocoa,jeelun/ReactiveCocoa,smilypeda/ReactiveCocoa,isghe/ReactiveCocoa,leichunfeng/ReactiveCocoa,icepy/ReactiveCocoa,on99/ReactiveCocoa,terry408911/ReactiveCocoa,bensonday/ReactiveCocoa,Pingco/ReactiveCocoa,hoanganh6491/ReactiveCocoa,BrooksWon/ReactiveCocoa,cnbin/ReactiveCocoa,200895045/ReactiveCocoa,vincentiss/ReactiveCocoa,esttorhe/ReactiveCocoa,sdhzwm/ReactiveCocoa,zhigang1992/ReactiveCocoa,sugar2010/ReactiveCocoa,zhukaixy/ReactiveCocoa,sujeking/ReactiveCocoa,zhiwen1024/ReactiveCocoa,ceekayel/ReactiveCocoa,yizzuide/ReactiveCocoa,huiping192/ReactiveCocoa,OneSmallTree/ReactiveCocoa,tzongw/ReactiveCocoa,takeshineshiro/ReactiveCocoa,rpowelll/ReactiveCocoa,hilllinux/ReactiveCocoa,dachaoisme/ReactiveCocoa,SanChain/ReactiveCocoa,lixar/ReactiveCocoa,cnbin/ReactiveCocoa,valleyman86/ReactiveCocoa,jeelun/ReactiveCocoa,Ricowere/ReactiveCocoa,windgo/ReactiveCocoa,ioshger0125/ReactiveCocoa,BlessNeo/ReactiveCocoa,hilllinux/ReactiveCocoa,icepy/ReactiveCocoa,on99/ReactiveCocoa,tzongw/ReactiveCocoa,windgo/ReactiveCocoa,brasbug/ReactiveCocoa,Ricowere/ReactiveCocoa,juliangrosshauser/ReactiveCocoa,Eveian/ReactiveCocoa,Ray0218/ReactiveCocoa,jsslai/ReactiveCocoa,CCOOOOLL/ReactiveCocoa,sujeking/ReactiveCocoa,ericzhou2008/ReactiveCocoa,emodeqidao/ReactiveCocoa,paulyoung/ReactiveCocoa,jrmiddle/ReactiveCocoa,yangyangluoluo/ReactiveCocoa