std.range.iota enhancement: supporting more types (AKA issue 10762)

[Francesco Cattoglio]

On Saturday, 28 December 2013 at 12:16:32 UTC, Joseph Rushton 
Wakeling wrote:
> On 28/12/13 09:06, Jakob Ovrum wrote:
>> [1] Which I'm not convinced of; e.g. `back` == `DateTime(2013, 
>> 1, 1) -
>> dur!"days"(5)`.
>
> Are you sure that's going to work if the iota covers a leap 
> year? :-)

And that's exactly the reason I choose 2012 as an example :D