add phobos module std.halffloat ?

[Rob T]

On Wednesday, 19 December 2012 at 20:44:19 UTC, Robert Jacques 
wrote:
>
> See std.numeric.CustomFloat. It supports quarter, half, single, 
> double and 80-bit. The wikipedia article on the  floating point 
> (IEEE 754) includes a Quad type but not a double-quad or 96-bit 
> type. 96-bit Should be possible, as it's just 80-bits with 
> padding. Quad and double quad would be tougher to do, do to the 
> lack of a quad integer type or a 112-bit bit shift operator.

I did not see anything in the reference docs to indicate 
consistency across platform. Do these produce constant results 
cross-platform? Actually do any of the basic floating point types 
do this (Real excluded)?

--rt