[This works](https://svelte.technology/repl?version=1.22.0&gist=a21e7cb64d0a4a61111b4cc332e6c2ef) (1.22), [this doesn't](https://svelte.technology/repl?version=1.23.0&gist=a21e7cb64d0a4a61111b4cc332e6c2ef) (1.23) — waggle the slider around.