Proxy_Cache::cache_result( mixed $data, string $cache_key, string $cache_group )

	public function cache_result( $data, $cache_key, $cache_group ) {
		if ( wp_using_ext_object_cache() ) {
			wp_cache_set( $cache_key, $data, $cache_group, self::CACHE_TTL );

			/**
			 * The Object Cache API doesn't provide a way to delete an entire cache group, so
			 * we build an extra cached value containing all the cached hashes in this group
			 * for use when we need to bust the entire group. See the bust_cache_group method.
			 */
			$cache_keys = wp_cache_get( 'cache_keys', $cache_group );
			$cache_keys = is_array( $cache_keys ) ? $cache_keys : [];

			if ( ! in_array( $cache_key, $cache_keys, true ) ) {
				$cache_keys[] = $cache_key;
			}

			wp_cache_set( 'cache_keys', $cache_keys, $cache_group );

		} else {
			set_transient( $cache_key . $cache_group, $data, self::CACHE_TTL );
		}
	}