Array for config setting in symfony

symfony_config_multi.yml

# non-obvious and sub-well-documented method to retrieve multiple values for
# config setting, e.g. sfConfig::get('app_offsite-testing-ip-addresses')

all:
  .options:
    offsite-testing-ip-addresses:
      - 192.168.35.184
      - 192.168.87.113

yes; it's the .foo notation that had been eluding me. I see now that this is mentioned at http://www.symfony-project.org/gentle-introduction/1_4/en/05-Configuring-Symfony#chapter_05_sub_custom_application_settings_and_app_yml