txt: ## period.md
  class Telemetry::Period
  
  Performance data over a period
  
  ```raku
  class Telemetry::Period is Telemetry { }
  
  ```
  
  **Note:**  This class is a Rakudo-specific feature and not standard Raku.
  
  ```raku
  # basic usage
  use Telemetry;
  my $t0 = Telemetry.new;
  # execute some code
  my $t1 = Telemetry.new;
  my $period = $t1 - $t0;  # creates Telemetry::Period object
  say "Code took $period<wallclock> microseconds to execute";
  
  ```
  
  A `Telemetry::Period` object contains the difference between two [`Telemetry`](/type/Telemetry) objects. It is generally not created by calling .new, but it can be if needed. For all practical purposes, it is the same as the [`Telemetry`](/type/Telemetry) object, but the **meaning** of the values is different (and the values are generally much smaller, as they usually are the difference of two big values of the [`Telemetry`](/type/Telemetry) objects from which it was created).
  