A problem I'm encountering deleting embedded documents using Mongoose

error log

node.js:134
        throw e; // process.nextTick error, or 'error' event on first tick
        ^
TypeError: Object #<Object> has no method 'remove'
    at /Users/sebastian/japes/mongotest/mongotest.js:34:22
    at /Users/sebastian/japes/mongotest/node_modules/mongoose/lib/mongoose/query.js:660:22
    at model.init (/Users/sebastian/japes/mongotest/node_modules/mongoose/lib/mongoose/document.js:147:5)
    at /Users/sebastian/japes/mongotest/node_modules/mongoose/lib/mongoose/query.js:658:16
    at /Users/sebastian/japes/mongotest/node_modules/mongoose/support/node-mongodb-native/lib/mongodb/cursor.js:130:9
    at /Users/sebastian/japes/mongotest/node_modules/mongoose/support/node-mongodb-native/lib/mongodb/cursor.js:176:11
    at /Users/sebastian/japes/mongotest/node_modules/mongoose/support/node-mongodb-native/lib/mongodb/cursor.js:491:35
    at [object Object].close (/Users/sebastian/japes/mongotest/node_modules/mongoose/support/node-mongodb-native/lib/mongodb/cursor.js:663:5)
    at [object Object].nextObject (/Users/sebastian/japes/mongotest/node_modules/mongoose/support/node-mongodb-native/l%  

mongotest.js

var mongoose = require('mongoose');
var db = mongoose.connect('mongodb://localhost/sebtest');

var Schema = mongoose.Schema;

var StackSchema = new Schema({
  name: String
  ,items: [StackItemSchema]
});

var StackItemSchema = new Schema({
  blob: Number
});

var Stack = mongoose.model('Stack', StackSchema);

Stack.find({name:'The Stack'}, function (err, docs) {
  var the_stack;

  if (docs === undefined) {      
    the_stack = new Stack({name: 'The Stack'});
    the_stack.save();
  } else {
    the_stack = docs[0];
  }
  
  console.log('Gonna add some items now');
  
  the_stack.items.push({ blob:Math.random() });
  the_stack.save();
  
  console.log(the_stack.items[0])
  
  the_stack.items[0].remove();
  
  
});

Please see https://gist.github.com/1059598