* Initial swing
* Finish up <snack-bar> implementation and integrate it
* Add missing types
* Use shift() since we dont care about referential equality
* Use `_` for private fields
* Remove rogue handler
* Remove impossible fallback value
* Make `<snack-bar>` actually contain its children
* will-change for the button ripple
* Guard against mutliple button action clicks
* `onhide()` -> `onremove()`
* remove transitionend
* Replace inline ref callback with linkRef
* showError only accepts strings
* Remove undefined initialization
* Throw on error
* Add missing error type.
* `SnackBar` ▶️ `Snack`
* Avoid child retaining a reference to parent, make show() return a Promise.
* async/await and avoid processing the stack if it is already being processed
* Add a meaningful return value to showSnackbar()
