Populate a users contacts - works in 2.3.9 but not in 2.3.10

populate.coffee

#!/usr/bin/env coffee

global.mongoose = require 'mongoose'
mongoose.connect 'mongodb://localhost/test'

Schema         = mongoose.Schema

User = new Schema
   userId         : { type: String, index: true, required: true }
   contacts       : [ { type: Schema.ObjectId, ref: 'User' } ]

User = mongoose.model('User', User)

User.remove {}, (err) -> console.log(err) if err
console.log "- cleaning out existing users"

contacts = []
userIds = [ 'A', 'B', 'C', 'D' ]
numRoles = userIds.length

userIds.forEach (userId,index) ->
  User.create { userId: userId }, (err, user) ->
    if err then console.log err

    console.log "+ creating user: #{user.userId}"
    contacts.push(user) unless user.userId is 'A'

    if --numRoles <= 0
       console.log "+ about to update contacts", contacts

       User.update {userId: 'A'}, { contacts: contacts }, (err) -> # NEVER GETS PAST HERE IN 2.3.10
         if err then console.log err
         console.log "+ updating testarc user to include contacts"
         process.exit()