First draft of removing native fallbacks for array extras.
First draft of removing native fallbacks for array extras.

snackshen/underscore,yekg880809/underscore,lucasfanning/underscore,Tim-Zhang/underscore,strongconjunctions/underscore,RepmujNetsik/underscore,jdelbello/underscore,JoaquinSiabra/underscore,natac13/underscore,ligson/underscore,craigmichaelmartin/underscore,imsingh/underscore,snackshen/underscore,mitar/underscore,Yangani/underscore,documentcloud/underscore,oss6/underscore,irr/underscore,ijidan/underscore,mjhasbach/underscore,xiaoqiang730730/underscore,elancom/underscore,jonot/underscore,eaglesjava/underscore,premkumargithub/underscore,dimitriwalters/underscore,ElseZhang/underscore,cintiamh/underscore,PengShi-sp/underscore,zhangguangyong/underscore,greyhwndz/underscore,jordanwink201/underscore,Forever8/underscore,prosenjit-itobuz/underscore,polandeme/underscore,gougouGet/underscore,ElseZhang/underscore,roychen-7/underscore,colemakdvorak/underscore,kwangkim/underscore,thisismygithub/underscore,paulfalgout/underscore,falqas/underscore,ligson/underscore,nickkneafsey/underscore,ThiagoGarciaAlves/underscore,singhsterabhi/underscore,aziz-boudi4/underscore,dkusch/underscore,WangRex/underscore,AaronNGray/underscore-server,akre54/underscore,polandeme/underscore,huzion/underscore,liminghui/underscore,cailong1028/underscore,cnwhy/underscore,jonot/underscore,SerenoShen/underscore,yuhualingfeng/underscore,Joanna913/underscore,SerenoShen/underscore,Gimcrack/underscore,yekg880809/underscore,dfurtado/underscore,beenlee/underscore,vinodbonala/underscore,zhangguangyong/underscore,amdjs/underscore,Tetpay/underscore,documentcloud/underscore,platinumazure/underscore,keepgoingwm/underscore,mairasala/underscore,zabefloyd/underscore,gougouGet/underscore,thiswildorchid/underscore,natac13/underscore,zabefloyd/underscore,Tim-Zhang/underscore,amdjs/underscore,cgvarela/underscore,mdboop/underscore,rlugojr/underscore,jolthoff/underscore,lqjack/underscore,dyx/underscore,imsingh/underscore,AaronNGray/underscore-server,ereddate/underscore,beenlee/underscore,irr/underscore,LiskHQ/underscore,JonAbrams/underscore,Yangani/underscore,janocat/underscore,jashkenas/underscore,jpalomar/underscore,jianganglu/underscore,sdwang/underscore,wjb12/underscore,lqjack/underscore,Gimcrack/underscore,wxmfront/underscore,craigmichaelmartin/underscore,PengShi-sp/underscore,tnga/underscore-es,eaglesjava/underscore,huzion/underscore,youprofit/underscore,youprofit/underscore,greyhwndz/underscore,cintiamh/underscore,platinumazure/underscore,mjhasbach/underscore,falqas/underscore,vinodbonala/underscore,jdelbello/underscore,rlugojr/underscore,ereddate/underscore,singhsterabhi/underscore,hackreactor/underscore,cgvarela/underscore,bkillenit/underscore,elancom/underscore,mitar/underscore,Aplopio/underscore,megawac/underscore,kuychaco/underscore,dxuehu/underscore,lis186/underscore,thiswildorchid/underscore,kairyan/underscore,jpalomar/underscore,JonAbrams/underscore,keepgoingwm/underscore,Feiyang1/underscore,liyandalmllml/underscore,ijidan/underscore,mdboop/underscore,Forever8/underscore,roychen-7/underscore,thisismygithub/underscore,kuychaco/underscore,hackreactor/underscore,premkumargithub/underscore,LiskHQ/underscore,JoaquinSiabra/underscore,dfurtado/underscore,appleboy/underscore,jfarid27/underscore,vincent1988/underscore,bkillenit/underscore,oss6/underscore,cnwhy/underscore,Feiyang1/underscore,dkusch/underscore,dxuehu/underscore,ryanwholey/underscore,wxmfront/underscore,kairyan/underscore,jfarid27/underscore,huangnan1/2016gitStudy,sdwang/underscore,ryanwholey/underscore,jolthoff/underscore,vincent1988/underscore,colemakdvorak/underscore,jordanwink201/underscore,starterstep/underscore,SeriaWei/underscore,jridgewell/underscore,veg/underscore,lucasfanning/underscore,ThiagoGarciaAlves/underscore,WangRex/underscore,aziz-boudi4/underscore,jianganglu/underscore,veg/underscore,lis186/underscore,nickkneafsey/underscore,jiankers/underscore,liminghui/underscore,RepmujNetsik/underscore,dyx/underscore,huangnan1/2016gitStudy,kwangkim/underscore,strongconjunctions/underscore,prosenjit-itobuz/underscore,jiankers/underscore,jridgewell/underscore,PUSEN/underscore,PUSEN/underscore,xiaoqiang730730/underscore,starterstep/underscore,janocat/underscore,debutt/underscore,Joanna913/underscore,componentizr/underscore,Aplopio/underscore,SeriaWei/underscore,braddunbar/underscore,akre54/underscore,jashkenas/underscore,emiel187/underscore,npmcomponent/jashkenas-underscore,debutt/underscore,liyandalmllml/underscore,tnga/underscore-es,yuhualingfeng/underscore,emiel187/underscore,mairasala/underscore,wjb12/underscore