requirement: don't merge formula and cask cache in `::expand`
requirement: don't merge formula and cask cache in `::expand`

nandub/brew,MikeMcQuaid/brew,claui/brew,EricFromCanada/brew,JCount/brew,MikeMcQuaid/brew,Homebrew/brew,nandub/brew,Homebrew/brew,nandub/brew,EricFromCanada/brew,MikeMcQuaid/brew,Homebrew/brew,JCount/brew,JCount/brew,Homebrew/brew,EricFromCanada/brew,claui/brew,nandub/brew,MikeMcQuaid/brew,JCount/brew,claui/brew,claui/brew,EricFromCanada/brew