Mympirun doesn't separate stdout and stderr

[redfast00]

Minimal example:

[vsc40000@gligar03]:~ $ cat hello_world.sh 
#!/bin/sh
echo "hello world"
echo "error" > /dev/stderr
[vsc40000@gligar03]:~ $ ./hello_world.sh > /dev/null
error
[vsc40000@gligar03]:~ $ mympirun ./hello_world.sh > /dev/null
[vsc40000@gligar03]:~ $

Expected behaviour

mympirun outputs stdout of the program to stdout, and stderr to stderr

Actual behaviour

mympirun outputs both stdout and stderr of the program to stdout

[stdweird]

why is this the expected behaviour? noone really uses it anyway since it messes up order and makes debugging harder?
but we should provide an option to let users shoot themself in the foot, sure