带阿拉伯字母的Fabric JS文本组件生成方式错误

var canvas = this.__canvas = new fabric.Canvas('c');
canvas.setDimensions({
 width:400,height:400
})
text = new fabric.IText('شريف', { 
  left: 50,
  top: 100,
  fontFamily: 'arial black',
  fill: '#333',
  fontSize: 50
})

canvas.add(text);
console.log(text.toSVG());
function printtest(){
  console.log(text.toSVG());
}

#c{
  border:1px solid red;
}

<script src="https://rawgit.com/kangax/fabric.js/master/dist/fabric.js"></script>
<button onclick="printtest()">print console</button><br>
<canvas id="c"></canvas>