Method safeNumber2

java/lib/src/main/java/io/github/ccxt/Exchange.java:8096–8101

(Object dictionary, Object key1, Object key2, Object... optionalArgs)

    }

    public Object safeNumber2(Object dictionary, Object key1, Object key2, Object... optionalArgs)
    {
        Object d = Helpers.getArg(optionalArgs, 0, null);
        Object value = this.safeString2(dictionary, key1, key2);
        return this.parseNumber(value, d);
    }

    public Object parseOrderBook(Object orderbook, Object symbol, Object... optionalArgs)
    {