pipe_process.html vs pipeProcess.html ?

[Timothee Cour via Digitalmars-d]

How come we have both
http://dlang.org/library/std/process/pipeProcess.html
and
http://dlang.org/library/std/process/pipe_process.html
?

Also, http://dlang.org/library/std/process/pipeProcess.html seems outdated
(eg, no workDir shown).