'Maximum call stack size exceeded' using async.forEachLimit

async = require('async');

var documents = ['a', 'b', 'c', 'd', 'e', 'f'];

async.forEachLimit(documents, 2, function(item, callback) {
  console.log(".", item);
  callback(null);
}, function(err){
  console.log("end", err);
});

Log

$ node test.js
. a
. a
. a
. a
. a
. a
end undefined
. b
. b
. b
. b
. b
. b
. b
. b
. b
. b
. b
. b
. b
. b
. b
. b
[...]

node.js:134
        throw e; // process.nextTick error, or 'error' event on first tick
        ^
RangeError: Maximum call stack size exceeded

[lipsumar]

I was doing a sync operation. I fixed it by changing from:

callback();

to

setTimeout(callback, 0);

[bobrik]

STOP calling SYNC functions in async.js