Should AsIs() set converter attribute to False?
One may still want the option to apply converter logic, so converter is not explicitly disabled.
According to the documentation of `AsIs`.

> Represents a Value that is treated as-is, and passed directly back to the database driver. This may be useful if you are using database extensions that accept native Python data-types and you do not wish Peewee to impose any handling of the values.

However, this is not true, as `peewee` impose handling of the value passed in `AsIs`on this line https://github.com/coleifer/peewee/blob/master/peewee.py#L622

Should `AsIs` initialize a `Value` object as following?

```python
def AsIs(value):
    return Value(value, converter=False, unpack=False)
```