open(<command>, "w") does not return a pipe

[bicycle1885]

open(`cmd`, "w") now return only a process object, and a pipe object is not returned.

~/v/julia (master|…) $ ./julia
               _
   _       _ _(_)_     |  A fresh approach to technical computing
  (_)     | (_) (_)    |  Documentation: https://docs.julialang.org
   _ _   _| |_  __ _   |  Type "?help" for help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 0.7.0-DEV.2528 (2017-11-18 19:55 UTC)
 _/ |\__'_|_|_|\__'_|  |  Commit 6e4f2fa226* (0 days old master)
|__/                   |  x86_64-apple-darwin16.7.0

julia> open(`ls`, "w")
Process(`ls`, ProcessExited(0))

I'm surprised because this change happened without any deprecation from Julia 0.6.1.

~/v/julia (master|…) $ julia
o               _
   _       _ _(_)_     |  A fresh approach to technical computing
  (_)     | (_) (_)    |  Documentation: https://docs.julialang.org
   _ _   _| |_  __ _   |  Type "?help" for help.
  | | | | | | |/ _` |  |
  | | |_| | | | (_| |  |  Version 0.6.1 (2017-10-24 22:15 UTC)
 _/ |\__'_|_|_|\__'_|  |  Official http://julialang.org/ release
|__/                   |  x86_64-apple-darwin14.5.0

julia> open(`ls`, "w")
(Pipe(RawFD(21) open => RawFD(-1) closed, 0 bytes waiting), Process(`ls`, ProcessExited(0)))

Is this intentional or a bug? I cannot find a topic that refers to this change and the docstring is not updated.