lib/Ext/data/NodeInterface.js
function(node) {
                    if (Ext.isObject(node) && !node.isModel) {
                        node = Ext.data.ModelManager.create(node, this.modelName);
                    }
                    // Make sure the node implements the node interface
                    return Ext.data.NodeInterface.decorate(node);
                }
function(node) {
                    if (Ext.isObject(node) && !node.isModel) {
                        node = Ext.data.ModelManager.create(node, this.modelName);
                    }
                    // Make sure the node implements the node interface
                    return Ext.data.NodeInterface.decorate(node);
                }
Ensures that the passed object is an instance of a Record with the NodeInterface applied
@return {Boolean}
@private