diff --git a/src/datetime.php b/src/datetime.php
index c5d2b5c..9617c79 100644
--- a/src/datetime.php
+++ b/src/datetime.php
@@ -209,7 +209,7 @@ function carbon(string $date, string $format = DATE_TIME_FORMAT_ISO): Carbon\Car
  * @return string
  * @see https://github.com/spatie-custom/blender/blob/master/app/Foundation/helpers.php
  */
-function roman_year(int $year = null): string
+function roman_year(?int $year = null): string
 {
     if (!is_numeric($year)) {
         $year = (int)date('Y');
diff --git a/src/validation.php b/src/validation.php
index b29188f..3758ac4 100644
--- a/src/validation.php
+++ b/src/validation.php
@@ -127,7 +127,7 @@ function isIntegerFloatingPoint($value, $unsigned = true): bool
         && $value <= PHP_INT_MAX && $value >= PHP_INT_MIN
         //big number rouned to int aproximately!
         //big number change into exp format
-        && ((int)((double)$value) == $value || (int)$value == $value || strpos(strtoupper((string)$value),
+        && ((int)((float)$value) == $value || (int)$value == $value || strpos(strtoupper((string)$value),
                                                                                'E') === false);
 }