[phobos] Clear appending cache?

[Andrei Alexandrescu]

On 11/18/10 2:15 PM, Steve Schveighoffer wrote:
> I think Appender should be as fast as possible when appending data, since that
> is what it's supposed to be good at.  I don't see a point of simply wrapping
> builtin array appending, what's so bad about the builtin syntax that you need to
> define a wrapper around it?

On the contrary, I want to make Appender as unnecessary as possible, and 
~= as efficient as possible without requiring the use of Appender.

Andrei