js/libs/ember-data.js
function(type, metadata) {
    type = this.modelFor(type);

    Ember.merge(this.typeMapFor(type).metadata, metadata);
  }
function(type, metadata) {
    type = this.modelFor(type);

    Ember.merge(this.typeMapFor(type).metadata, metadata);
  }
If you have some metadata to set for a type
you can call `metaForType`.

@method metaForType
@param {String or subclass of DS.Model} type
@param {Object} metadata