by opennota:

Some use cases for tickers require stopping the ticker and restarting it later.  This
behaviour can be emulated using time.After, but it requires creating new timers each
time you want to restart it.  I suggest to add the following methods:

  // NewUnstartedTicker returns a new ticker, but does not start it.
  func NewUnstartedTicker(d Duration) *Ticker

  // Start starts stopped or unstarted ticker.
  func (*Ticker) Start()