message: Use approximate.
diff: @@ -10,7 +10,7 @@ skip_if_no_top();
  require __DIR__ . '/../include/bootstrap.php';
  define('FRAME_DATA_SIZE', 100 * 1024);
  -define('REQUESTS_TIMES', 16);
  +define('REQUESTS_TIMES', 24);
  $pm = new ProcessManager();
  $pm->parentFunc = function () use ($pm) {
  @@ -60,9 +60,9 @@ $pm->childFunc = function () use ($pm) {
  phpt_echo("=== worker real ===\n");
  phpt_var_dump($worker_real = array_column($mem_records, 'worker_real'));
  for ($i = $records_count / 2; $i < $records_count; $i++) {
  - assert($master_virtual[$i] === $master_virtual[$records_count / 2]);
  - assert($worker_virtual[$i] === $worker_virtual[$records_count / 2]);
  - assert($worker_real[$i] === $worker_real[$records_count / 2]);
  + assert(approximate($master_virtual[$i], $master_virtual[$records_count / 2]));
  + assert(approximate($worker_virtual[$i], $worker_virtual[$records_count / 2]));
  + assert(approximate($worker_real[$i], $worker_real[$records_count / 2]));
  }
  $server->shutdown();
  return;
  