convert symbol to string

src/Lib/Types.php

@@ -29,7 +29,7 @@ class Types implements ILib
         ));
 
         $env->set('str', new CoreFunc('str', 'Convert arguments to string and concatenate them together.', 0, -1,
-            fn (...$args) => implode('', array_map('strval', $args))
+            fn (...$args) => implode('', array_map([$this, 'getStrValue'], $args))
         ));
 
         $env->set('symbol', new CoreFunc('symbol', 'Convert argument to symbol.', 1, 1,
@@ -134,4 +134,13 @@ class Types implements ILib
             fn ($a) => $a % 2 !== 0
         ));
     }
+
+    private function getStrValue($a)
+    {
+        if ($a instanceof Symbol) {
+            return $a->getName();
+        }
+
+        return strval($a);
+    }
 }