"operator overloading"

If you're doing maths with `five`, typing out all these brackets:

```
var result = five() * five() * five();
```

...is kind of tedious.

In the math context, we can assume you don't want the i18n/l10n or any of the other secondary features this module provides.

This reduces math-related friction so you can do `five * five`, `five + five / five - five` and so on. Maths-related use cases should now be a lot easier!