The new std.process is ready for review

[Andrei Alexandrescu]

On 2/26/13 2:16 AM, Jonathan M Davis wrote:
> On Tuesday, February 26, 2013 08:08:33 Lars T. Kyllingstad wrote:
>> What if the variable is set, but empty?  Is that very different
>> from the situation where it doesn't exist at all?  In my opinion,
>> when it comes to environment variables, no.
>
> And yet, there _is_ a difference. I've dealt with code before that simply cared
> about whether an environment variable was set and not at all what it was set
> to. Regardless of whether that's desirable behavior, any program that needs to
> be compatible with a program that follows that behavior will need to be able
> to follow that behavior as well. So, if std.process is set up so that you
> can't tell the difference betwen an environment variable which hasn't been set
> and one that's been set to nothing, then that's a problem, even if it's not
> the most common case.
>
> - Jonathan M Davis

Guess we could go with returning a null string if nonexistent and "" if 
it does. This makes the implementation space about as subtle as the 
problem space.

Andrei