http://josephdepqbvoq7tm7uvynwmsji4354zmd3yp3rrtc245rilvq4ixayd.onion/posts
> ) { self . init ( get : { bindingToOptional . wrappedValue != nil } , set : { newValue in if ! newValue { bindingToOptional . wrappedValue = nil } else { os_log ( . error , "Optional binding mapped to optional has been set to `true`, which will have no effect.