code: function shouldAddSympathy() {
  	// If `force-sympathy` flag is enabled, always clear persistent state.
  	if ( config.isEnabled( 'force-sympathy' ) ) {
  		return true;
  	}
  
  	// If `no-force-sympathy` flag is enabled, never clear persistent state.
  	if ( config.isEnabled( 'no-force-sympathy' ) ) {
  		return false;
  	}
  
  	// Otherwise, in development mode, clear persistent state 25% of the time.
  	if ( 'development' === process.env.NODE_ENV && Math.random() < 0.25 ) {
  		return true;
  	}
  
  	// Otherwise, do not clear persistent state.
  	return false;
  }
docs: Determines whether to add "sympathy" by randomly clearing out persistent
  browser state and loading without it
  
  Can be overridden on the command-line with two flags:
  - ENABLE_FEATURES=force-sympathy npm start (always sympathize)
  - ENABLE_FEATURES=no-force-sympathy npm start (always prevent sympathy)
  
  If both of these flags are set, then `force-sympathy` takes precedence.
  
  @returns {boolean} Whether to clear persistent state on page load