__traits isCopyable vs isPOD

[Per Nordlöw]

On Monday, 28 November 2022 at 20:58:43 UTC, Per Nordlöw wrote:
> For which types `T` does
>
> ```d
> __traits(isCopyable, T)
> ```
>
> differ from
>
> ```d
> __traits(isPOD, T)
> ```
>
> ?

I'm asking because I have code like

```d
             static if (__traits(isCopyable, Element))
                 insertAt(element, index);
             else
                 insertAt(move(element), index);
```

and I wonder if one in those cases should be using `isCopyable` 
or `isPOD`.