Code review: JSON unmarshaller

[Tyler Jameson Little]

Here's the updated code. It's got a marshaller and unmarshaller:

https://gist.github.com/3894337

It's about 650 lines. If you have time, I'd be very interested in 
getting some feedback (or from anyone else who sees this post of 
course).

The main problem I'm having right now is that classes/structs 
have to be static. I'm not 100% sure why the compiler cannot see 
non-static classes/structs at compile time. Do you happen to know 
why? It seems like a template should work in either case, 
assuming I'm understanding D templates correctly.

I didn't find any clear documentation for static outer classes, 
only static inner classes. It's not the same as static Java 
classes, which cannot be instantiated (if memory serves).