Add 'none' id-transformer

src/adapters/z2m.ts

@@ -270,11 +270,12 @@ export class Z2MAdapter extends Adapter<Z2MConfig> {
   
   #idTransform(text: string): string {
     const transform = {
+      'none': (x: string) => x,
       'snake-case': snakecase('-'),
       'snake_case': snakecase('_')      
-    }[this.config.idTransform || 'snake-case'];
+    }[this.config.idTransform || 'none'];
 
-    return transform(text) || snakecase('-')(text);
+    return transform(text) || text;
   }
 
   /**