Remove unused param `startIndex` from flatten()
Remove unused param `startIndex` from flatten()

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