Weak Purity Blog Post

[sarn via Digitalmars-d-announce]

Yeah, there's a lot more stuff I could have talked about, but I 
think I'll leave it for other posts.

About testing, I think the way protection works in D (i.e., 
private members are accessible within the same file) is 
important, too.  I was a bit suspicious of that feature when I 
first looked at D (coming from C++) but now I actually like the 
kind of project structure it leads to.  I think better 
testability is just one of the advantages, but I'll write up a 
full blog post sometime.