joyent/node — pull request #4393 by tricknotes (2012-12-10 09:14:49+00:00)
Title: events: Use assigned variable instead of `arguments`

Always `arguments[0]` is used when `EventEmitter#emit` called.
Using assigned variable is faster than `arguments[0]`.

----
Benchmark: https://gist.github.com/4249528

```
arguments[0]:
731 ms
assigned variable:
12 ms
```