Thinking about the difference between fixed and 'dynamic' arrays.

[rikki cattermole]

Okay you have misunderstand a lot here.

We have two types of arrays:

- Static, fixed sized stored on stack.
- Dynamic, variable sized, stored on the heap.

However dynamic arrays are not actually a distinct type in the type 
system, its a language extension to use runtime hooks using the GC.

What dynamic arrays are in the language is just slices.

A slice is a length + pointer pair. This is where almost all of the 
syntax for dynamic arrays come from.

```d
int[] slice;
```

That is a slice.

```d
slice ~= 32;
```

Now it is a dynamic array as it was allocated via the GC.

```d
int[4] staticArray;
slice = staticArray[];
```

The slice is now able to modify the staticArray!