    # File lib/supplemental/facets/tuple.rb, line 205
        def cast_from_string( str, &yld )
          args = str.to_s.split(/\W+/)
          div = /\W+/.match( str.to_s )[0]
          if block_given?
            args = args.collect{ |a| yld[a] }
          else
            args = args.collect { |i| /^[0-9]+$/ =~ i ? i.to_i : i }
          end
          self.instance(args) #.divider( div )
        end