zb: use string in safeTicker ccxt/ccxt#11379
diff --git a/js/zb.js b/js/zb.js
index cf25ab309606..beafb3bc7867 100644
--- a/js/zb.js
+++ b/js/zb.js
@@ -618,29 +618,29 @@ module.exports = class zb extends Exchange {
         //     }
         //
         const timestamp = this.safeInteger (ticker, 'date', this.milliseconds ());
-        const last = this.safeNumber (ticker, 'last');
+        const last = this.safeString (ticker, 'last');
         return this.safeTicker ({
             'symbol': this.safeSymbol (undefined, market),
             'timestamp': timestamp,
             'datetime': this.iso8601 (timestamp),
-            'high': this.safeNumber (ticker, 'high'),
-            'low': this.safeNumber (ticker, 'low'),
-            'bid': this.safeNumber (ticker, 'buy'),
+            'high': this.safeString (ticker, 'high'),
+            'low': this.safeString (ticker, 'low'),
+            'bid': this.safeString (ticker, 'buy'),
             'bidVolume': undefined,
-            'ask': this.safeNumber (ticker, 'sell'),
+            'ask': this.safeString (ticker, 'sell'),
             'askVolume': undefined,
             'vwap': undefined,
-            'open': this.safeNumber (ticker, 'open'),
+            'open': this.safeString (ticker, 'open'),
             'close': last,
             'last': last,
             'previousClose': undefined,
             'change': undefined,
             'percentage': undefined,
             'average': undefined,
-            'baseVolume': this.safeNumber (ticker, 'vol'),
+            'baseVolume': this.safeString (ticker, 'vol'),
             'quoteVolume': undefined,
             'info': ticker,
-        }, market);
+        }, market, false);
     }
 
     parseOHLCV (ohlcv, market = undefined) {

ccxt/ccxt#11379