Deprecate real

[Walter Bright via Digitalmars-d]

On 6/30/2017 5:20 AM, jmh530 wrote:
> I've never found real confusing.
> 
> However, I do see some people confused by the fact that floating point 
> operations may do intermediate steps at higher precision. Walter has provided 
> the reasoning before and I think I agree with it. However, I think a case could 
> be made for having an option to disable it and force intermediate calculations 
> to be done at the precision of the type. I would consider it to be something of 
> low importance, but other people might value it more.

https://github.com/dlang/druntime/pull/1621