fix: parse a funding trade is incorrect

Signed-off-by: chang-ning <[email protected]>

Author: crazyguitar

lib/transports/ws2.js

@@ -979,13 +979,12 @@ class WSv2 extends EventEmitter {
     let data = payload
 
     if (this._transform) { // correctly parse single trade/array of trades
-      const M = eventName[0] === 'f' ? FundingTrade : PublicTrade
-      const trades = M.unserialize(data)
+      const M = eventName[0] === 'f' && data[0].length === 8 ? FundingTrade : PublicTrade
 
-      if (_isArray(trades) && trades.length === 1) {
-        data = trades[0]
+      if (_isArray(payload) && payload.length === 1) {
+        data = payload[0]
       } else {
-        data = trades
+        data = payload
       }
 
       data = new M(data)