Cleanup `_.difference` and `_.union`.
Cleanup `_.difference` and `_.union`.


Former-commit-id: 1fcaab3989caaaacd9fe73de071d8f360f52b715
Jaspersoft/lodash,Lottid/lodash,ajefremovs/lodash,javiosyc/lodash,chrootsu/lodash,Moykn/lodash,Droogans/lodash,julianocomg/lodash,jasnell/lodash,prawnsalad/lodash,neouser99/lodash,greyhwndz/lodash,leolin1229/lodash,phillipalexander/lodash,BernhardRode/lodash,jacwright/lodash,jasnell/lodash,phillipalexander/lodash,gutenye/lodash,hitesh97/lodash,mjosh954/lodash,lzheng571/lodash,af7/lodash,tgriesser/lodash,AndBicScadMedia/lodash,naoina/lodash,hitesh97/lodash,lzheng571/lodash,enng0227/lodash,prawnsalad/lodash,timruffles/lodash,r14r/fork_javascript_lodash,andersonaguiar/lodash,developer-prosenjit/lodash,boneskull/lodash,shwaydogg/lodash,felixshu/lodash,reggi/lodash,schnerd/lodash,dgoncalves1/lodash,ror/lodash,nsamarcos/lodash,prawnsalad/lodash,stewx/lodash,jzning-martian/lodash,transGLUKator/lodash,IveWong/lodash,rtorr/lodash,gdi2290/lodash,AneesMohammed/lodash,felixshu/lodash,PhiLhoSoft/lodash,lekkas/lodash,huyinghuan/lodash,af7/lodash,af7/lodash,neouser99/lodash,zestia/lodash,ricardohbin/lodash,shwaydogg/lodash,BernhardRode/lodash,bnicart/lodash,AneesMohammed/lodash,r14r-work/fork_javascript_lodash,Andrey-Pavlov/lodash,xiwc/lodash,javiosyc/lodash,woldie/lodash,steelsojka/lodash,samuelbeek/lodash,zestia/lodash,greyhwndz/lodash,jshanson7/lodash,hafeez-syed/lodash,youprofit/lodash,hafeez-syed/lodash,reggi/lodash,xixilive/lodash,andersonaguiar/lodash,rlugojr/lodash,benweet/lodash,polarbird/lodash,developer-prosenjit/lodash,polarbird/lodash,ajefremovs/lodash,joshuaprior/lodash,neouser99/lodash,joshuaprior/lodash,lekoaf/lodash,Xotic750/lodash,zhangguangyong/lodash,beaugunderson/lodash,transGLUKator/lodash,youprofit/lodash,rlugojr/lodash,tquetano-r7/lodash,therebelbeta/lodash,PhiLhoSoft/lodash,tquetano-r7/lodash,studiowangfei/lodash,rtorr/lodash,Jaspersoft/lodash,gdi2290/lodash,tejokumar/lodash,developer-prosenjit/lodash,bnicart/lodash,gutenye/lodash,woldie/lodash,ror/lodash,jshanson7/lodash,huyinghuan/lodash,xiwc/lodash,enng0227/lodash,Andrey-Pavlov/lodash,boneskull/lodash,zestia/lodash,ricardohbin/lodash,mshoaibraja/lodash,stewx/lodash,krahman/lodash,krahman/lodash,stewx/lodash,Xotic750/lodash,tejokumar/lodash,naoina/lodash,krrg/lodash,zhangguangyong/lodash,zhangguangyong/lodash,jzning-martian/lodash,leolin1229/lodash,BernhardRode/lodash,justintung/lodash,tonyonodi/lodash,leolin1229/lodash,justintung/lodash,tejokumar/lodash,samuelbeek/lodash,MaxPRafferty/lodash,dgoncalves1/lodash,jacwright/lodash,timruffles/lodash,xixilive/lodash,AndBicScadMedia/lodash,hafeez-syed/lodash,MaxPRafferty/lodash,studiowangfei/lodash,transGLUKator/lodash,ror/lodash,codydaig/lodash,lekkas/lodash,msmorgan/lodash,krahman/lodash,jzning-martian/lodash,nbellowe/lodash,samuelbeek/lodash,r14r/fork_javascript_lodash,ajefremovs/lodash,krrg/lodash,therebelbeta/lodash,Droogans/lodash,beaugunderson/lodash,Moykn/lodash,PhiLhoSoft/lodash,codydaig/lodash,studiowangfei/lodash,polarbird/lodash,IveWong/lodash,nbellowe/lodash,mjosh954/lodash,imjerrybao/lodash,tquetano-r7/lodash,naoina/lodash,Moykn/lodash,lzheng571/lodash,krrg/lodash,r14r/fork_javascript_lodash,lekoaf/lodash,nsamarcos/lodash,nsamarcos/lodash,MaxPRafferty/lodash,AndBicScadMedia/lodash,ricardohbin/lodash,r14r-work/fork_javascript_lodash,phillipalexander/lodash,benweet/lodash,xiwc/lodash,Andrey-Pavlov/lodash,tgriesser/lodash,Lottid/lodash,schnerd/lodash,mshoaibraja/lodash,Jaspersoft/lodash,msmorgan/lodash,mjosh954/lodash,IveWong/lodash,benweet/lodash,imjerrybao/lodash,julianocomg/lodash,lekkas/lodash,r14r-work/fork_javascript_lodash,steelsojka/lodash,gutenye/lodash,huyinghuan/lodash,hitesh97/lodash,chrootsu/lodash,timruffles/lodash,andersonaguiar/lodash,schnerd/lodash,mshoaibraja/lodash,imjerrybao/lodash,woldie/lodash,xixilive/lodash,tgriesser/lodash,chrootsu/lodash,rtorr/lodash,bnicart/lodash,codydaig/lodash,Lottid/lodash,Xotic750/lodash,nbellowe/lodash,jacwright/lodash,AneesMohammed/lodash,joshuaprior/lodash,justintung/lodash,jshanson7/lodash,tonyonodi/lodash,enng0227/lodash,youprofit/lodash,lekoaf/lodash,jasnell/lodash,dgoncalves1/lodash,greyhwndz/lodash,felixshu/lodash,shwaydogg/lodash,Droogans/lodash,javiosyc/lodash,reggi/lodash,julianocomg/lodash,therebelbeta/lodash