fix: phpstan level=6

src/Primitive.php

@@ -10,7 +10,7 @@ namespace ctiso;
 
 class Primitive {
     // varchar
-    public static function to_varchar($value)
+    public static function to_varchar($value): string
     {
         return ((string) $value);
     }
@@ -26,28 +26,28 @@ class Primitive {
         return filter_var($value, FILTER_VALIDATE_BOOLEAN);//(int)((bool) $value);
     }
 
-    public static function from_bool($value)
+    public static function from_bool($value): bool
     {
         return ((bool) $value);
     }
 
     // int
-    public static function to_int($value)
+    public static function to_int($value): int
     {
         return ((int) $value);
     }
 
-    public static function from_int($value)
+    public static function from_int($value): string
     {
         return ((string) $value);
     }
-   
+
     // date
     public static function to_date($value)
     {
         $result = 0;
         $tmp = explode("/", $value ?? '', 3);
-        
+
         if (count($tmp) != 3) {
             return $result;
         }
@@ -63,7 +63,7 @@ class Primitive {
                 return 0;
             }
         }
-        
+
         return $result;
     }
 
@@ -110,7 +110,7 @@ class Primitive {
     }
 
     // array
-    public static function to_array($value) 
+    public static function to_array($value)
     {
         return (is_array($value)) ? $value : [];
     }