default attributes and environment attributes seem to be merged

default[:rayo][:gateway][:external]=[
    'gw.tropo.local',
    '192.168.1.33',
    'localhost'
]

chef_type:            environment
cookbook_versions:    {}
default_attributes:   {}
description:          
json_class:           Chef::Environment
name:                 ec2_rayo_functional_tests
override_attributes: 
  authorization: 
    sudo: 
      groups:       
          admin
          wheel
          sysadmin
      passwordless:  true
      users:        
          jdyer
          mperez
          jdecastro
  base_voxeo:    
    services: 
      on: 
          munin-node
          crond
          haldaemon
          irqbalance
          lvm2-monitor
          mcstrans
          messagebus
          microcode_ctl
          network
          ntpd
          readahead_early
          readahead_later
          restorecond
          smartd
          sshd
          syslog-ng
          sysstat
          xfs
  ejabberd:      
    domains:  ["xmpp.__________"]
  prism:         
    VxLaunch:  
      Commands: 
        as: 
          MaxPermSize:  512m
    artifacts: 
      checksum:  61015212bb4cbd53bf0a83d315c62bae77381d27dcee4d588da14d669c491412
      url:       https://__________C201111112119_0-x64.bin
  rayo:          
    cluster:  true
    gateway: 
      external:  ["rayo-gw1-ext.__________"]
      internal:  ["rayo-gw1.__________"]
      routes:    [".*=rayo@xmpp.__________"]
    jolokia: 
      remote: 
          localhost
          127.0.0.1
          66.193.54.0/24
    maven:    maven.voxeo.net
    node:    
      gateway:  rayo-gw1.__________
      routes:   [".*=rayo-gw1.__________"]

[root@rayo-gw1 WEB-INF]# shef -z
loading configuration: /etc/chef/client.rb
Session type: client
Loading...[Tue, 06 Dec 2011 10:16:49 -0500] INFO: Run List is [role[voxeo], role[rayo_gateway]]
[Tue, 06 Dec 2011 10:16:49 -0500] INFO: Run List expands to [users::sysadmins, base_voxeo, sudo, prism, rayo::gateway]
[Tue, 06 Dec 2011 10:16:49 -0500] INFO: Loading cookbooks [base_voxeo, prism, rayo, sudo, users]
done.

This is shef, the Chef shell.
 Chef Version: 0.10.4
 http://www.opscode.com/chef
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run `help' for help, `exit' or ^D to quit.

Ohai2u jdyer@rayo-gw1.____.net!
chef > node[:rayo][:gateway][:external]
 => ["rayo-gw1-ext.____.net"] 
chef > quit

11:36:56 jdyer@aleph.local chef master ? knife node show rayo-gw1.__________ -a rayo         
rayo: 
  artifacts:    
    gateway: 
      checksum:  
      url:       
    node:    
      checksum:  
      url:       
  bindAddress:   10.110.___.89
  cluster:       true
  gateway:      
    domains:  
        10.110.___.89
        rayo-gw1.__________
        rayo-gw1
    external: 
        gw.tropo.local
        192.168.1.33
        localhost
        rayo-gw1-ext.__________
        rayo-gw1.__________
        10.110.241.89
        rayo-gw1
    internal: 
        internal.tropo.local
        rayo-gw1.__________
    routes:    [".*=rayo@xmpp.__________"]
  jolokia:      
    commands: 
        read
        list
        exec
        version
    remote:   
        localhost
        127.0.0.1
        66.193.54.0/24
  local_domain:  rayo-gw1.__________
  maven:         maven.voxeo.net
  node:         
    domains: 
        10.110.___.89
        rayo-gw1.__________
        rayo-gw1
    gateway:  rayo-gw1.__________
    routes:   [".*=rayo-gw1.__________"]
  routes:        []