# File lib/hashery/path_hash.rb, line 60
    def []=(key,value)
      @flat.reject! {|k,v| k == key || k =~ Regexp.new("^#{key}/")}
      if value.is_a?(Hash)
        flatten_to_hash(value).each do |hk,hv|
          @flat[key.to_s+'/'+hk.to_s] = hv
        end
      else
        @flat[key.to_s] = value
      end
    end