fraction doesn't work on randAggregation

[PumpedSardines]

Is this a regression?

No

Description

When passing in the argument fraction to the function randAggregation nothing changes

Please provide a link to a minimal reproduction of the bug

No response

Please provide the exception or error you saw

Inputing

function Demo(props) {
  return <Preview source={() => randAggregation({ values: 5, fraction: 5 })}/>;
}

On the docs page will not provide fractions

### Please provide the environment you discovered this bug in

```true
On the docs page

Anything else?

No response

Do you want to create a pull request?

No