Bug; `initFromData` returns an array of array of OverType objects

As the title describes, it looks like `OverType.initFromData()` returns an array of an array of OverType objects.... I can't imagine this is intentional?

Example:

```javascript
let test = OverType.initFromData(...);

console.log("Test: ", test);
/* 
 * Test: [ [ {...} ] ]
 */ 
```