old_contents: import time
  from prometheus_client import _INF
  
  # TODO(korfuri): if python>3.3, use perf_counter() or monotonic().
  
  
  def Time():
      """Returns some representation of the current time.
  
      This wrapper is meant to take advantage of a higher time
      resolution when available. Thus, its return value should be
      treated as an opaque object. It can be compared to the current
      time with TimeSince().
      """
      return time.time()
  
  
  def TimeSince(t):
      """Compares a value returned by Time() to the current time.
  
      Returns:
        the time since t, in fractional seconds.
      """
      return time.time() - t
  
  
  def PowersOf(logbase, count, lower=0, include_zero=True):
      """Returns a list of count powers of logbase (from logbase**lower)."""
      if not include_zero:
          return [logbase ** i for i in range(lower, count)] + [_INF]
      else:
          return [0] + [logbase ** i for i in range(lower, count)] + [_INF]
  
new_contents: import time
  from prometheus_client import _INF
  
  # TODO(korfuri): if python>3.3, use perf_counter() or monotonic().
  
  
  def Time():
      """Returns some representation of the current time.
  
      This wrapper is meant to take advantage of a higher time
      resolution when available. Thus, its return value should be
      treated as an opaque object. It can be compared to the current
      time with TimeSince().
      """
      return time.time()
  
  
  def TimeSince(t):
      """Compares a value returned by Time() to the current time.
  
      Returns:
        the time since t, in fractional seconds.
      """
      return time.time() - t
  
  
  def PowersOf(logbase, count, lower=0, include_zero=True):
      """Returns a list of count powers of logbase (from logbase**lower)."""
      if not include_zero:
          return [logbase ** i for i in range(lower, count+lower)] + [_INF]
      else:
          return [0] + [logbase ** i for i in range(lower, count+lower)] + [_INF]
  
subject: Fix PowersOf to return `count` items, not "numbers up to base**count".