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/// - Parameter completion: NodeCompletion callback which returns the result of Node submission. public func next<T>(completion:@escaping NodeCompletion<T>) { if T.self as AnyObject? === Token.self { next { (token: Token?, node, error) in completion(token as? T, node, error) } } else if T.self as AnyObject? === AccessToken.self { next { (token: AccessToken?, node, error) in completion(token as? T, node, error) } } else if T.self as AnyObject? === FRUser.self { next { (user: FRUser?, node, error) in completion(user as? T, node, error) } } else { completion(nil, nil, AuthError.invalidGenericType) } }