`Array.isArray()` is defined by ES5. I see no reason why it would step backward for Node 0.10. I believe `util.isArray()` comes from an era where V8 was not yet ES5-compliant. We just made the choice to be compatible with 0.10+ going forward (skip 0.8), so I see no more reason to use `util.isArray()` instead of `Array.isArray()`.

Opinion?