Merge branch '6.4' into 7.3

* 6.4:
  [Mailer][MailJet] Fix forbidden headers case-sensitive comparison
  do not cast too big floats to int

Author: fabpot

Extension/Core/DataTransformer/NumberToLocalizedStringTransformer.php

@@ -173,7 +173,7 @@ protected function getNumberFormatter(): \NumberFormatter
      */
     protected function castParsedValue(int|float $value): int|float
     {
-        if (\is_int($value) && $value === (int) $float = (float) $value) {
+        if (\is_int($value) && (($float = (float) $value) < \PHP_INT_MAX) && $value === (int) $float) {
             return $float;
         }