diff --git a/src/Digits.php b/src/Digits.php
index 767784bd..c72c5091 100644
--- a/src/Digits.php
+++ b/src/Digits.php
@@ -45,7 +45,7 @@ public function isValid(mixed $value): bool
 
         $digits = preg_replace('/[^0-9]/', '', (string) $value);
 
-        if ($value !== $digits) {
+        if ((string) $value !== $digits) {
             $this->error(self::NOT_DIGITS);
             return false;
         }
diff --git a/test/DigitsTest.php b/test/DigitsTest.php
index 8e9457ac..2ed0889f 100644
--- a/test/DigitsTest.php
+++ b/test/DigitsTest.php
@@ -23,13 +23,13 @@ protected function setUp(): void
      * Ensures that the validator follows expected behavior for basic input values
      */
     #[DataProvider('basicDataProvider')]
-    public function testExpectedResultsWithBasicInputValues(string $input, bool $expected): void
+    public function testExpectedResultsWithBasicInputValues(mixed $input, bool $expected): void
     {
         self::assertSame($expected, $this->validator->isValid($input));
     }
 
     /**
-     * @psalm-return array<string, array{0: string, 1: bool}>
+     * @psalm-return array<string, array{0: mixed, 1: bool}>
      */
     public static function basicDataProvider(): array
     {
@@ -39,11 +39,17 @@ public static function basicDataProvider(): array
             'invalid; contains alphabetic chars and one whitespace' => ['abc 123', false],
             'invalid; contains only alphabetic chars'               => ['abcxyz',  false],
             'invalid; contains alphabetic and special chars'        => ['AZ@#4.3', false],
-            'invalid; is a float'                                   => ['1.23',    false],
-            'invalid; is a hexa notation'                           => ['0x9f',    false],
+            'invalid; string float'                                 => ['1.23',    false],
+            'invalid; float'                                        => [1.23,      false],
+            'Hex string'                                            => ['0x9f',    false],
+            'Hex int'                                               => [0x9f,      true],
             'invalid; is empty'                                     => ['',        false],
+            'Boolean'                                               => [true,      false],
+            'Null'                                                  => [null,      false],
+            'Array'                                                 => [['123'],   false],
 
             'valid; is a normal integer'                            => ['123',     true],
+            'any integer'                                           => [123,       true],
             'valid; starts with a zero'                             => ['09',      true],
             // phpcs:enable
         ];