Preliminary submission - std.rational and std.typelist

[Jonathan M Davis]

On Monday, October 08, 2012 00:14:04 Arlen wrote:
> >  So, we're not adding TypeList.
> 
> Oh, I was aware that a decision had already been made.  I thought it
> was an open issue.

It was decided the last time that std.typelist was brought up. Basically, 
TypeList doesn't provide enough over TypeTuple to be worth it, and we don't 
want two different abstractions for essentially the same thing.

> Since TypeList is out of the question, I need to figure out what to do
> with the units library first.

Well, there may very well be cases that are more work due to the lack of 
TypeList, but it should be possible to make them work with TypeTuple, though 
it could mean adding more functionality to std.typetuple to make it work.

- Jonathan M Davis