mdSelect :'multiple' is specified as a boolean option, but behaves as flag

[ggranum]

Technically this could be fixed by updating the docs to indicate that multiple is a flag. However, so far as I know, there is no spiffy flag-attribute shortcut for Angular like there is in Polymer, so leaving it as a flag would be a pain.

I added a note to the relevant commit line. Well, probably the relevant line:
786cb3b#commitcomment-10108925

[rschmukler]

@ggranum this is consistent with how a native select behaves, so I would be in favor of documenting it as a flag as opposed to making it just be a boolean. Example

[ggranum]

While I despise flag attributes, I wouldn't argue with maintaining consistency between specs - if it works in Angular 1.x. :~)

My understanding is that Angular had to modify the behavior of disabled (ng-disabled) and selected for similar reasons:
https://docs.angularjs.org/api/ng/directive/ngDisabled
https://docs.angularjs.org/api/ng/directive/ngSelected

My interpretation of the main paragraph of that first link is that, if there were a short, HTML valid way to deal with flag options in Angular 1.4, it would have been used in place of creating the ngDisabled directive.

If you can demonstrate how to create a mdSelect that can toggle between multiple and single select with boolean parameter, great!

best,