Bug(?) in process.stdin.pipe in node 0.12.0

[remy]

Related gist with files: https://gist.github.com/remy/fd1e75688390fd0d13ad

Run the spawn.js under node 0.10.x and when the child exit... output is shown, type something (i.e. to feed stdin) and it should be echoed out (I typed rs):

» node spawn.js
child exit - but stdin should still work...
rs
captured rs

When I run with node 0.12.0, the process just exits as soon as anything enters stdin (which is unexpected behaviour):

» node spawn.js
child exit - but stdin should still work...
rs
» 

I think it has to do with the child having exit, but I've tried to unpipe in the exit event, but that makes no difference, and I can't work out how to keep listening to the stdin stream after the child has died...