All of these `bstat.method`s are executed in the context of the `bstat` object so `this` could be used in place of `bstat`.  While `this` is a mere 1 character shorter than `bstat`, the savings becomes greater if we namespace this logic a bit more as suggested in [this comment](https://github.com/misterbisson/bstat/pull/8/files#r12321713).

This code:

```js
bstat.testing.clean_variations( bstat.testing.variations );
```

would be reduced to:

```js
this.clean_variations( this.variations );
```