# File lib/librarian/config/database.rb, line 49
      def [](key, scope = nil)
        case scope
        when "local", :local then local[key]
        when "env", :env then env[key]
        when "global", :global then global[key]
        when nil then local[key] || env[key] || global[key]
        else raise Error, "bad scope"
        end
      end