stdout blocks but says its flushing - see testcase.sh

consumer.js

// do nothing
setInterval(function() {
	// just to keep the program going	
}, 1000)

producer.js

var data = new Buffer(10*1024);
data.fill(97);

for (var i = 0; i < 10; i++) {
	console.error('flushed?', process.stdout.write(data) !== false);
}

console.error('end of program');

testcase.sh

# this will not print end-of-program
node producer.js | node consumer.js