Another micro benchmark:

```
$ ./python-master -m pyperf timeit -o m1.json 'b=b"foobar"' -- 'b.decode()'
.....................
Mean +- std dev: 93.1 ns +- 2.4 ns

$ ./python -m pyperf timeit -o m2.json 'b=b"foobar"' -- 'b.decode()'
.....................
Mean +- std dev: 83.1 ns +- 2.6 ns

$ ./python -m pyperf compare_to m1.json m2.json
Mean +- std dev: [m1] 93.1 ns +- 2.4 ns -> [m2] 83.1 ns +- 2.6 ns: 1.12x faster (-11%)
```