# File lib/fog/rackspace/models/storage/metadata.rb, line 68
        def []=(key, value)
          return nil unless key
          if @data[key.to_s]
            @data[key.to_s] = value
          elsif @data[key.to_sym]
            @data[key.to_sym] = value
          else
            @data[key] = value
          end
        end