Demonstrate the Set-like nature of Options collections
Demonstrate the Set-like nature of Options collections

Options collections are backed by Sets, and thus trying to push a new
option with a name that duplicates an existing option cannot succeed.

Later, we can exploit this behavior and remove some conditionals.

gregory-nisbet/brew,sjackman/homebrew,gregory-nisbet/brew,nandub/brew,AnastasiaSulyagina/brew,aw1621107/brew,nandub/brew,ilovezfs/brew,bfontaine/brew,muellermartin/dist,rwhogg/brew,staticfloat/brew,palxex/brew,EricFromCanada/brew,Linuxbrew/brew,gordonmcshane/homebrew,sjackman/homebrew,konqui/brew,MikeMcQuaid/brew,mgrimes/brew,nandub/brew,mistydemeo/homebrew,reitermarkus/brew,claui/brew,Linuxbrew/brew,bfontaine/brew,Linuxbrew/brew,JCount/brew,zmwangx/brew,toonetown/homebrew,DomT4/brew,hanxue/linuxbrew,ilovezfs/brew,Homebrew/brew,vitorgalvao/brew,reitermarkus/brew,reitermarkus/brew,hanxue/linuxbrew,EricFromCanada/brew,konqui/brew,amar-laksh/brew_sudo,mahori/brew,claui/brew,sjackman/homebrew,pseudocody/brew,alyssais/brew,toonetown/homebrew,reelsense/brew,vitorgalvao/brew,mahori/brew,konqui/brew,jmsundar/brew,vitorgalvao/brew,hanxue/linuxbrew,maxim-belkin/brew,nandub/brew,JCount/brew,muellermartin/dist,DomT4/brew,pseudocody/brew,amar-laksh/brew_sudo,rwhogg/brew,MikeMcQuaid/brew,amar-laksh/brew_sudo,claui/brew,pseudocody/brew,reitermarkus/brew,mahori/brew,aw1621107/brew,bfontaine/brew,palxex/brew,MikeMcQuaid/brew,mgrimes/brew,mistydemeo/homebrew,palxex/brew,mahori/brew,Homebrew/brew,Linuxbrew/brew,EricFromCanada/brew,maxim-belkin/brew,reelsense/brew,zmwangx/brew,maxim-belkin/brew,DomT4/brew,JCount/brew,tonyg/homebrew,vitorgalvao/brew,toonetown/homebrew,MikeMcQuaid/brew,staticfloat/brew,AnastasiaSulyagina/brew,alyssais/brew,claui/brew,reelsense/brew,zmwangx/brew,gordonmcshane/homebrew,rwhogg/brew,staticfloat/brew,Homebrew/brew,jmsundar/brew,alyssais/brew,tonyg/homebrew,gregory-nisbet/brew,sjackman/homebrew,mistydemeo/homebrew,DomT4/brew,ilovezfs/brew,mgrimes/brew,gordonmcshane/homebrew,JCount/brew,Homebrew/brew,aw1621107/brew,muellermartin/dist,tonyg/homebrew,EricFromCanada/brew,konqui/brew,jmsundar/brew,AnastasiaSulyagina/brew