Setup

cd /path/to/rails/app/src
cat config/initializers/config.rb
Config.setup do |config|
  config.const_name = 'Settings'
  config.use_env = true
  config.env_prefix = 'SETTINGS'
  config.env_separator = '__'
  config.env_converter = :downcase
  config.env_parse_values = true
end
cat config/settings/test.yml
provider: :bam

SETTINGS__PROVIDER=:bam RAILS_ENV=test bin/rails c
Settings.provider # => ":bam"   want symbol instead of string

RAILS_ENV=test bin/rails c
Settings.provider # => :bam  got symbol as expected

maybe related to issue#194? Thanks.