# File lib/vendor/okjson.rb, line 434
  def hexenc4(t, u)
    t.putc(Hex[(u>>12)&0xf])
    t.putc(Hex[(u>>8)&0xf])
    t.putc(Hex[(u>>4)&0xf])
    t.putc(Hex[u&0xf])
  end