jashkenas/backbone — pull request #2825 by jpumford (2013-10-23 21:37:33+00:00)
Title: Change Documented Method Signature of "new Collection" and "new Model"

According to the source code, supplying models and attributes for
"new Backbone.Collection" and "new Backbone.Model", respectively,
are NOT optional. If "models"/"attributes" is omitted and "options"
supplied "options" will be used as if it were a model or an array
of models.