diff --git a/src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php b/src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php
index 029d45637c63..991f06434a5b 100644
--- a/src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php
+++ b/src/Illuminate/Database/Eloquent/Concerns/HasAttributes.php
@@ -2101,7 +2101,7 @@ public function originalIsEquivalent($key)
         }
 
         return is_numeric($attribute) && is_numeric($original)
-            && BigDecimal::of($attribute)->isEqualTo($original);
+            && strcmp((string) $attribute, (string) $original) === 0;
     }
 
     /**
diff --git a/tests/Integration/Database/DatabaseEloquentModelCustomCastingTest.php b/tests/Integration/Database/DatabaseEloquentModelCustomCastingTest.php
index bfa3d533514b..8bbdb68c0271 100644
--- a/tests/Integration/Database/DatabaseEloquentModelCustomCastingTest.php
+++ b/tests/Integration/Database/DatabaseEloquentModelCustomCastingTest.php
@@ -169,33 +169,6 @@ public function testDeviableCasts()
         $this->assertSame((new Decimal('320.988'))->getValue(), $model->price->getValue());
     }
 
-    public function testDirtyOnCustomNumericCasts()
-    {
-        $model = new TestEloquentModelWithCustomCast;
-        $model->price = '123.00';
-        $model->save();
-
-        $this->assertFalse($model->isDirty());
-
-        $model->price = '123.00';
-        $this->assertFalse($model->isDirty('price'));
-
-        $model->price = '123.0';
-        $this->assertFalse($model->isDirty('price'));
-
-        $model->price = '123';
-        $this->assertFalse($model->isDirty('price'));
-
-        $model->price = '00123.00';
-        $this->assertFalse($model->isDirty('price'));
-
-        $model->price = '123.4000';
-        $this->assertTrue($model->isDirty('price'));
-
-        $model->price = '123.0004';
-        $this->assertTrue($model->isDirty('price'));
-    }
-
     public function testSerializableCasts()
     {
         $model = new TestEloquentModelWithCustomCast;