out of principle. maybe except when you need to add core functionality where missing (like in IE).
reasons I would think of:
- improper for...in loops (I know that you won’t make that mistake)
- abuse (just because someone can do does not mean it is a good idea to)
- DOM will inherit it
The computer is always right. The computer is always right. The computer is always right. Take it from someone who has programmed for over ten years: not once has the computational mechanism of the machine malfunctioned.
André Behrens, NY Times Software Developer