Added test for float comparison null checks (#33433)

Co-authored-by: Stephen Shead <[email protected]>

Author: sshead

tests/Database/DatabaseEloquentModelTest.php

@@ -91,6 +91,16 @@ public function testDirtyAttributes()
         $this->assertTrue($model->isDirty(['foo', 'bar']));
     }
 
+    public function testFloatAndNullComparisonWhenDirty()
+    {
+        $model = new EloquentModelCastingStub();
+        $model->floatAttribute = null;
+        $model->syncOriginal();
+        $this->assertFalse($model->isDirty('floatAttribute'));
+        $model->forceFill(['floatAttribute' => 0.0]);
+        $this->assertTrue($model->isDirty('floatAttribute'));
+    }
+
     public function testDirtyOnCastOrDateAttributes()
     {
         $model = new EloquentModelCastingStub;