perf(slice): fix not to use `Array#slice`
perf(slice): fix not to use `Array#slice`

DDunc/async,XM-Right/async,arigo-software/async,imjerrybao/async,jamesjnadeau/async,chaddm/async,imjerrybao/async,JulianVolodia/async,carck/async,kolomiichenko/async,rlugojr/async,LeoYao/async,Segeon-Kim/async,jaruba/async,arigo-software/async,jaruba/async,markyen/async,XM-Right/async,megawac/async,abhishekgahlot/async,wrenth04/async,jnordberg/async,haggholm/async,steverobb/async,haggholm/async,youprofit/async,SaiNadh001/async,justincy/async,r14r/fork_javascript_async,wrenth04/async,justincy/async,RickyDan/async,carck/async,KnottedRain/async,sjclijie/async,ibakaidov/async,LeoYao/async,Kikobeats/async,ecasilla/async,caolan/async,megawac/async,rborisov/async,zhakui/async,Qix-/async,garysye/async,Zhang/async,lonely8rain/async,FrankSunnyvale/async,hargasinski/async,andalm/async,mcanthony/async,r14r-work/fork_javascript_async,beni55/async,navyxie/async,modulexcite/async,r14r/fork_javascript_async,mcanthony/async,kolomiichenko/async,navyxie/async,abhishekgahlot/async,bjlxj2008/async,zhakui/async,ecasilla/async,ariesnah/async,moander/async,chaddm/async,renruixi/async,r14r-work/fork_javascript_async,DaAwesomeP/async,jnordberg/async,Zhang/async,zhhb/async,gypsydave5/async,moander/async,DanieleTassone/async,steverobb/async,DaAwesomeP/async,xiebaochun/async,Connectlegendary/async,rborisov/async,DanieleTassone/async,modulexcite/async,xiebaochun/async,scq000/async,evdevgit/async,Kikobeats/async,pandoraui/async,scq000/async,andalm/async,caolan/async,sjclijie/async,tjwudi/async,KnottedRain/async,bjlxj2008/async,llwanghong/async,rlugojr/async,ariesnah/async,tjwudi/async,lonely8rain/async,Connectlegendary/async,ibakaidov/async,markyen/async,FrankSunnyvale/async,JulianVolodia/async,beni55/async,renruixi/async,DDunc/async,SaiNadh001/async,Qix-/async,evdevgit/async,gypsydave5/async,hargasinski/async,Segeon-Kim/async,pandoraui/async,ezubarev/async,garysye/async,suguru03/async,RickyDan/async,zhhb/async,youprofit/async,suguru03/async,jamesjnadeau/async,ezubarev/async,llwanghong/async,Segeon-Kim/async