Added mem::safe_recursive_clone, and while it works for regex, it's actually slower then remaking it. Hmmmm, maybe because some of the stdlib is inefficent

stdlib/map.krak

@@ -43,6 +43,9 @@ obj map<T,U> (Object) {
         keys.add(key)
         values.add(value)
     }
+    fun contains_key(key: T): bool {
+        return keys.contains(key)
+    }
     fun get(key: T): U {
         return values.get(keys.find(key))
     }