# File lib/hiera/config.rb, line 51
    def validate!
      case @config[:merge_behavior]
      when :deep,'deep',:deeper,'deeper'
        begin
          require "deep_merge"
        rescue LoadError
          Hiera.warn "Ignoring configured merge_behavior"
          Hiera.warn "Must have 'deep_merge' gem installed."
          @config[:merge_behavior] = :native
        end
      end
    end