Form : cast error : integer instead of string

src/Form.php

@@ -61,7 +61,7 @@ class Form
     /**
      * Define a class for form object
      */
-    public $formClass = "form-horizontal";
+    public string $formClass = "form-horizontal";
 
     /**
      * The logging callable method
@@ -141,7 +141,7 @@ class Form
      * Set the fieldwidth
      * @param integer $val The fieldwidth
      */
-    public function fieldwidth($val): self
+    public function fieldwidth(int $val): self
     {
         $this->fieldwidth = $val;
         return $this;
@@ -149,9 +149,9 @@ class Form
 
     /**
      * Set the formClass
-     * @param integer $val The formClass
+     * @param string $val The formClass
      */
-    public function formClass($val): self
+    public function formClass(string $val): self
     {
         $this->formClass = $val;
         return $this;