When you override backbone sync, both model/collection .save()/fetch() uses the same backbone sync method, so what is the best way to check if what Backbone.sync recieves is a model or a collection of models?

As an example:

Backbone.sync = function(method, model, options){

  //Model here can be both a collection or a single model so

 if(model.isModel()) // there is no isModel or isCollection method

}

I suppose I am looking for a safe best practice, I could of course check for certain attributes or methods that only a model or a collection have, but it seems hackish, shouldn't there be a better obvious way? And there probably is I just couldn't find it.

Thanks!