Solve the programming task below in a Python markdown code block.
Given a non-negative integer, return an array / a list of the individual digits in order.

Examples:

```
123 => [1,2,3]

1 => [1]

8675309 => [8,6,7,5,3,0,9]
```
Also feel free to reuse/extend the following starter code:
```python
def digitize(n):
```