Array append performance 2

[Christian Kamm]

> Extra note: while creating it I have found another bug in DMD I didn't
> know about:
> 
> import std.stdio: writefln;
> void main() {
>     alias int[2] T;
>     writefln(T.init);
> }
> 
> This program has to print [0,0] instead of 0.

Actually, I don't think the D spec requires typeof(T.init) == T. And T is a
valid initializer for T[N]:

int[3] arr = 5; // sets all elements to 5

Christian