Remove parentheses around a replaced expression

If I replace a parenthesized expression, the parentheses are still printed, regardless of they are necessary or not.

```javascript
var ast = recast.parse('(1+2)*3').program.body[0].expression;
ast.left = recast.types.builders.literal(3);
recast.print(ast).code //"(3)*3"
```
Is it possible to remove the exptra parentheses? Is it a bug?