Function cleanCallback

deprecated/node-binance-api.js:4986–4986

                if (Binance.options.reconnect) futuresAggTradeStream(symbols, callback);
            };
            let subscription, cleanCallback = data => callback(fAggTradeConvertData(data));
            if (Array.isArray(symbols)) {
                if (!isArrayUnique(symbols)) throw Error('futuresAggTradeStream: "symbols" cannot contain duplicate elements.');
                let streams = symbols.map(symbol => symbol.toLowerCase() + '@aggTrade');