core-selector multiple selection binding to selected not working

[fedy2]

The binding to selected property modifies the passed List adding the original List as element.
More details here: http://stackoverflow.com/questions/26926815/dart-polymer-core-selector-multiple-selection-binding-to-selected-not-working

[jakemac53]

Looks like this is happening because of an Array.isArray check on selected (on the js side).

The hack around this is to create a JsArray instead of an ObservableList and set that in the binding instead. It won't be observable on the dart side of things, but you might not need it to be.