RFC: Units of measurement for D (Phobos?)

[Nordlöw via Digitalmars-d]

On Wednesday, 16 March 2016 at 17:46:39 UTC, David Nadlinger 
wrote:
> Hi Per,
>
> Many thanks for working on the code! Could you put it up as a 
> separate Dub package to make it easier for people to try out?

Ok, I'll do that in a couple of days. In the mean while could you 
take a look at the overloads of sin, cos and tan  in si.d. I just 
want to start at something, IMHO, having type-safe handling of 
angles in trigonometric functions would some projects more 
correct.

This is cheap solution (used by many unit-libraries) uses a 
floating-point-scaling of the radian unit. Which of course may 
result in loss accuracy. A better approach to represent degrees 
would of course be to use `ScaledUnit`. How should then sin, cos, 
tan, expi be redesigned to support `ScaledUnit` aswell as 
`Quantity`? Could you, please, highlight the basic idea here or 
perhaps give a code.

Thanks in advance, David.