…ll()` function

Currently:
```python
>>> import dill
>>> dill.pickles(__builtins__)  # __builtins__.all() raises a TypeError for a missing argument
False
>>> dill.copy(__builtins__)
<module 'builtins' (built-in)>
>>> _ is __builtins__
True
```

Expected:
```python
>>> import dill
>>> dill.pickles(__builtins__, exact=True)
True
```