+-----------+-----------------+------------------------+------------------------+
| Benchmark | rustpython_orig | mapping                | mapping+sequence        |
+===========+=================+========================+========================+
| fannkuch  | 3.79 sec        | 3.67 sec: 1.03x faster | 3.65 sec: 1.04x faster |
+-----------+-----------------+------------------------+------------------------+

+-----------+---------+-------------------------+
| Benchmark | cpython | rustpython-final        |
+===========+=========+=========================+
| fannkuch  | 354 ms  | 3.64 sec: 10.26x slower |
+-----------+---------+-------------------------+