Add strict option to distinct attribute validation (#36669)

src/Illuminate/Validation/Concerns/ValidatesAttributes.php

@@ -556,7 +556,7 @@ public function validateDistinct($attribute, $value, $parameters)
             return empty(preg_grep('/^'.preg_quote($value, '/').'$/iu', $data));
         }
 
-        return ! in_array($value, array_values($data));
+        return ! in_array($value, array_values($data), in_array('strict', $parameters));
     }
 
     /**

tests/Validation/ValidationValidatorTest.php

@@ -2395,6 +2395,15 @@ public function testValidateDistinct()
         $v->messages()->setFormat(':message');
         $this->assertSame('There is a duplication!', $v->messages()->first('foo.0'));
         $this->assertSame('There is a duplication!', $v->messages()->first('foo.1'));
+
+        $v = new Validator($trans, ['foo' => ['0100', '100']], ['foo.*' => 'distinct'], ['foo.*.distinct' => 'There is a duplication!']);
+        $this->assertFalse($v->passes());
+        $v->messages()->setFormat(':message');
+        $this->assertSame('There is a duplication!', $v->messages()->first('foo.0'));
+        $this->assertSame('There is a duplication!', $v->messages()->first('foo.1'));
+
+        $v = new Validator($trans, ['foo' => ['0100', '100']], ['foo.*' => 'distinct:strict']);
+        $this->assertTrue($v->passes());
     }
 
     public function testValidateDistinctForTopLevelArrays()