No space around operators under high roots

Created by: lutalli

MathJax doesn't add space around the operators under a root with an order, like a cube root, fourth root, nth root, etc.

Example: If I write

\[ \sqrt{x+y} \qquad \sqrt[3]{x+y} \]

I get the following result: Notice the difference between the normal square root on the left, where there is space around the + symbol, and the cube root on the right, where there is no space.

I'm working on Safari with the latest version (3.1.2) of MathJax.

Thanks!