docs: def RetryUntilReturnsTrue(tries, delay=2, backoff=1.5):
    '''Retries a function or method until it returns True.
  
    delay sets the initial delay in seconds, and backoff sets the factor by which
    the delay should lengthen after each failure. backoff must be greater than 1,
    or else it isn't really a backoff. tries must be at least 0, and delay
    greater than 0.'''
  
    if backoff <= 1:
      raise ValueError("backoff must be greater than 1")
  
    tries = math.floor(tries)
    if tries < 0:
      raise ValueError("tries must be 0 or greater")
  
    if delay <= 0:
      raise ValueError("delay must be greater than 0")
  
    def deco_retry(f):
      def f_retry(*args, **kwargs):
        mtries, mdelay = tries, delay # make mutable
  
        rv = f(*args, **kwargs) # first attempt
        while mtries > 0:
          if rv: # Done on success
            return rv
  
          mtries -= 1      # consume an attempt
          time.sleep(mdelay) # wait...
          mdelay *= backoff  # make future wait longer
         
          rv = f(*args, **kwargs) # Try again
  
        return False # Ran out of tries :-(
  
      return f_retry # true decorator -> decorated function
    return deco_retry