code: func (m *Machine) Set(name, value string) {
  	i := 4
  	if m.IsDefault {
  		i = 2
  	}
  	for i+2 < len(m.tokens) {
  		if m.tokens[i] == name {
  			m.tokens[i+2] = value
  			return
  		}
  		i = i + 4
  	}
  	m.tokens = append(m.tokens, "  ", name, " ", value, "\n")
  }
docs: // Set a property on the machine