StoppingPolicy.longest never stop?

[tsukikage]

tsukikage wrote:
> Why this zip not stop after iterated through the longest range? thanks!
> 
> import std.stdio, std.range ;
> void main() {
>     auto a = [1,2,3,4] ;
>     auto b = [6,7,8,9] ;
>     auto c = "ABCDE" ;   // <= longest range here
>     auto d = "ZYXW" ;
>     auto CNT = 0 ;
>     foreach(p; zip(StoppingPolicy.longest, a,b,c, d))
>         if(CNT++ < 30)
>             writefln("%s %s %s %s", p[0],p[1],p[2], p[3]) ;
>         else
>             break ;
> }
> 
> output:
> 1 6 A Z
> 2 7 B Y
> 3 8 C X
> 4 9 D W
> 0 0 E ￿
> 0 0 ￿ ￿
> 0 0 ￿ ￿ <= this continue infinitely if not supply a stopping _CNT_

note: ￿ is 0xffff (wchar init?) print as "%s"