Group <style> tags?

I have this:
```html
a{color:red}
a{color:blue}
```

And I get this:
```html
a{color:red}a{color:#00f}
```

But I expect this:
```html
a{color:#00f}
```

Or, at least this:
```html
a{color:red}a{color:#00f}
```

Would be really helpful, couldn't find any flag here or in clean-css... thanks!