# File lib/ruote/exp/fe_set.rb, line 147
    def set_vf (key, value)

      field = true

      if m = PREFIX_REGEX.match(key)
        field = m[1][0, 1] == 'f'
        key = m[2]
      end

      field ? set_f(key, value) : set_v(key, value)
    end