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A Backbone extend implementation that merges properties rather than overrides". Useful for inheritting defaults and other attributes which are objects on a model.

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This module should be imported before any models that need this functionality are derived as <Class>.extend is written on all objects on creation time.

var Model = Backbone.Model.extend({
    defaults: {
        a: 1
    defaults: {
        b: 2
var model = new Model;
model.get('a') // => 1 
model.get('b') // => 2