AC-2563: Deprecation notices in \DateTimeFormatter::formatObject()

Co-authored-by: Max Lesechko <[email protected]>

Author: xmav

lib/internal/Magento/Framework/Stdlib/DateTime/DateTimeFormatter.php

@@ -69,7 +69,7 @@ protected function doFormatObject($object, $format = null, $locale = null)
         } elseif (is_numeric($format)) {
             $dateFormat = $format;
             $timeFormat = \IntlDateFormatter::FULL;
-        } elseif (is_string($format) || null == $format) {
+        } elseif (is_string($format) || null === $format) {
             $dateFormat = $timeFormat = \IntlDateFormatter::MEDIUM;
             $pattern = $format;
         } else {