Why 1f.iota(100f).array returns double[] not float[]?

[Dominikus Dittes Scherkl via Digitalmars-d-learn]

On Tuesday, 8 September 2015 at 07:17:01 UTC, Ali Çehreli wrote:
> https://github.com/D-Programming-Language/phobos/blob/master/std/range/package.d#L4630
>
> auto iota(B, E)(B begin, E end)
> if (isFloatingPoint!(CommonType!(B, E)))
> {
>     return iota(begin, end, 1.0);
> }
>
Such kind of stuff would better be written as

auto iota(B, E)(B begin, E end)
{
     return iota(begin, end, cast(CommonType!(B, E))1.0);
}

this doesn't need a constraint anymore, or maybe use

if(isNumeric!(CommonType!(B, E)))

I tend to use the above kind of cast often, because I like to 
work with ubyte or ushort, and every f***ing number literal 
changes the type to uint :-/