Bind ng-options to ES6 Map

[bcherny]

let map = new Map()
map.set(1, 'foo')
map.set(2, 'bar')
map.set(3, 'baz')

<select ng-model="myModel" ng-options="map"></select>

this allows for non-string model values, without resorting to a custom $parser.

[petebacondarwin]

I like this idea. We should consider it for Angular 1.5

[uriva]

updates?

[gkalpak]

There is some discussion about adding support for ES6 iterables (Set, Map, etc) to ngRepeat/$watchCollection in #14600 btw.

This does not directly affect ngOptions, but is still relevant, since now we can bind to any type of value with ngRepeat+ngValue (in 1.6+).