Updating `fontWeight` property on a `TextView`

I need to dynamically update `fontWeight` property of a `TextView` but this doesn't seem to work for the canvas implementation of `TextView`. This works perfectly fine for DOM implementation. I am using following method to update - 

``` javascript
someTextView.updateOpts({
    fontWeight: 'bold'
});
```

Any pointers to fix this or a workaround would be appreciated.
