previousValue isn't actually optional, but it can be undefined
previousValue isn't actually optional, but it can be undefined

There's a difference

artivilla/desktop,j-f1/forked-desktop,artivilla/desktop,say25/desktop,desktop/desktop,shiftkey/desktop,artivilla/desktop,desktop/desktop,j-f1/forked-desktop,shiftkey/desktop,j-f1/forked-desktop,desktop/desktop,say25/desktop,kactus-io/kactus,j-f1/forked-desktop,kactus-io/kactus,artivilla/desktop,kactus-io/kactus,desktop/desktop,say25/desktop,say25/desktop,shiftkey/desktop,shiftkey/desktop,kactus-io/kactus