Node's `assert.deepEqual() algorithm` as a standalone module. Exactly like
[deep-equal](https://github.com/substack/node-deep-equal) except for the fact that `deepEqual(NaN, NaN) === true`.
This module is around [5 times faster](https://gist.github.com/2790507)
than wrapping `assert.deepEqual()` in a `try/catch`.