Review feedback: clarify that cache helper is for internal use

includes/functions.php

@@ -11,7 +11,9 @@ function is_internal_event( $action ) {
 
 /**
  * Flush plugin's internal caches
+ *
+ * FOR INTERNAL USE ONLY - see WP-CLI; all other cache clearance should happen through the `Cron_Options_CPT` class
  */
-function flush_internal_caches() {
+function _flush_internal_caches() {
 	return wp_cache_delete( Cron_Options_CPT::CACHE_KEY );
 }

includes/wp-cli/class-cache.php

@@ -12,7 +12,7 @@ class Cache extends \WP_CLI_Command {
 	 * @subcommand flush
 	 */
 	public function flush_internal_caches( $args, $assoc_args ) {
-		$flushed = \Automattic\WP\Cron_Control\flush_internal_caches();
+		$flushed = \Automattic\WP\Cron_Control\_flush_internal_caches();
 
 		if ( $flushed ) {
 			\WP_CLI::success( __( 'Internal caches cleared', 'automattic-cron-control' ) );