opApply not called for foeach(container)

[monarch_dodra]

On Wednesday, 11 July 2012 at 20:24:42 UTC, Jonathan M Davis 
wrote:
> The problem is that it's essentially spread out across 3 
> places: the online
> spec, TDPL, and the compiler.
>
> ...
>
> - Jonathan M Davis

The problem is not only the documentation, it's getting 
authoritative answers. I see some strange behaviors, and I can't 
for the life of find out if it is a bug in the 
documentation/compiler, or a pitfall/misunderstanding.

What is your take on the issue at hand? Bug or Pitfall?