code: function isWorkerCmd(cmd) {
  	cmd = cmd.concat(); // make a local copy of the array
  
  	// a worker has the same command line as the current process!
  	if (cmd.shift() !== process.execPath) return false; // execPath was used when spawning children
  
  	// workers *may* have more params, we care if all master params exist in the worker cli
  	for (var idx = 0; idx < master_args.length; idx++) {
  		if (cmd[idx] !== master_args[idx]) return false;
  	}
  
  	return true;
  }
docs: computed once now