Playing with stdin and out on a docker container

gistfile1.txt

vagrant@precise64:~/src/wctest$ cat Dockerfile 
FROM base

ENTRYPOINT ["wc"]
vagrant@precise64:~/src/wctest$ cat Dockerfile | docker run -i rufus/wc -
vagrant@precise64:~/src/wctest$ docker ps -a
ID                  IMAGE               COMMAND                CREATED             STATUS              PORTS
44c791634de4        rufus/wc:latest     wc -                   8 seconds ago       Exit 0                                  
969d44ad3004        rufus/wc:latest     wc -                   2 minutes ago       Exit 0                                  
cef084dba8ec        rufus/wc:latest     wc -                   2 minutes ago       Up 2 minutes                            
a6f7de006f2a        rufus/wc:latest     wc -                   6 minutes ago       Exit 0                                  
65b8e225c01a        rufus/wc:latest     wc -                   13 minutes ago      Up 13 minutes                           
85de1d2d6397        rufus/wc:latest     wc -                   14 minutes ago      Exit 0                                  
c81cbac8958a        rufus/wc:latest     wc -                   15 minutes ago      Exit 0                                  
0d71f1efe01b        base:latest         wc /bin/sh -c #(nop)   15 minutes ago      Exit 0                                  
vagrant@precise64:~/src/wctest$ docker logs 44c791634de4
      3       4      29 -
vagrant@precise64:~/src/wctest$ 

# Ok, adding more CMDs, like -c

vagrant@precise64:~/src/wctest$ cat Dockerfile | docker run -i rufus/wc -c
vagrant@precise64:~/src/wctest$ docker ps -a
ID                  IMAGE               COMMAND                CREATED             STATUS              PORTS
92dc1950177f        rufus/wc:latest     wc -c                  5 seconds ago       Exit 0                                  
44c791634de4        rufus/wc:latest     wc -                   2 minutes ago       Exit 0                                  
969d44ad3004        rufus/wc:latest     wc -                   3 minutes ago       Exit 0                                  
cef084dba8ec        rufus/wc:latest     wc -                   4 minutes ago       Up 4 minutes                            
a6f7de006f2a        rufus/wc:latest     wc -                   8 minutes ago       Exit 0                                  
65b8e225c01a        rufus/wc:latest     wc -                   15 minutes ago      Up 15 minutes                           
85de1d2d6397        rufus/wc:latest     wc -                   16 minutes ago      Exit 0                                  
c81cbac8958a        rufus/wc:latest     wc -                   17 minutes ago      Exit 0                                  
0d71f1efe01b        base:latest         wc /bin/sh -c #(nop)   17 minutes ago      Exit 0                                  
vagrant@precise64:~/src/wctest$ docker logs 92dc1950177f
29
vagrant@precise64:~/src/wctest$ 

I expected the output from the docker run to show up on stdout, just like it did when running the same commands on the host.

According to kstaken, this works fine on the latest build from master branch, and the output from wc goes to stdout