XOR returned value from id function by constant

src/runtime/builtin_modules/builtins.cpp

@@ -181,7 +181,7 @@ extern "C" Box* sum(Box* container, Box* initial) {
 }
 
 extern "C" Box* id(Box* arg) {
-    i64 addr = (i64)(arg);
+    i64 addr = (i64)(arg) ^ 0xdeadbeef00000003;
     return boxInt(addr);
 }
 

test/tests/id.py

@@ -2,7 +2,8 @@ x = 'Hi'
 y = 1
 z = (42, 7)
 f = (2,) + z
-id(x)
-id(y)
-id(z)
-id(f)
+print id(x) == id(x)
+print id(y) != id(x)
+print id(z) == id(z)
+print id(f) != id(z)
+