When you need to map the result of a block invoked a fixed amount
of times, you have an option between:

```
Array.new(n) { ... }
```

and:

```
n.times.map { ... }
```

The latter one is about 60% slower.

As suggested by @deniskorobicyn, adding a link from the `README.md`
to the PR, which has more information on performance characteristics.