Final by default?

[Walter Bright]

On 3/13/2014 1:43 AM, Don wrote:
> The worst breaking change in D2, by far, is the prevention of array stomping.
>
> After that change, our code still runs, and produces exactly the same results,
> but it is so slow that it's completely unusable. This one of the main reasons
> we're still using D1.

I didn't know this. I'd like more details - perhaps I can help with how to deal 
with it.