# File lib/bundler/settings.rb, line 153
    def all
      env_keys = ENV.keys.grep(/\ABUNDLE_.+/)

      keys = @temporary.keys | @global_config.keys | @local_config.keys | env_keys

      keys.map do |key|
        key.sub(/^BUNDLE_/, "").gsub(/__/, ".").downcase
      end
    end