Fastai

New Features

- callable support for `Self` ([162](https://github.com/fastai/fastcore/issues/162))
- add filter func to `first` ([161](https://github.com/fastai/fastcore/issues/161))
- `maybe_open` context manager and fast `image_size` funcion ([160](https://github.com/fastai/fastcore/issues/160))

Bugs Squashed

- Redundent `L.map_filter` removed (since `L.map.filter` does the same thing)

Breaking Changes

- `change param name `copy_meta`->`as_copy` in `retain_meta` ([157](https://github.com/fastai/fastcore/issues/157))

New Features

- `groupby` extensions for `int` and `str` instead of callables, and an optional `val` transform ([155](https://github.com/fastai/fastcore/issues/155))
- add `modified_env` ([148](https://github.com/fastai/fastcore/issues/148))

Bugs Squashed

- `coll_repr` printing incorrectly when `max_n`!=10 ([154](https://github.com/fastai/fastcore/pull/154)), thanks to [kessido](https://github.com/kessido)

New Features

- add `true`, `NullType`, `null`, and `tonull` ([153](https://github.com/fastai/fastcore/issues/153))
- add `working_directory` ([151](https://github.com/fastai/fastcore/issues/151))
- move `bind` et al to `fastcore.basics` ([150](https://github.com/fastai/fastcore/issues/150))

New Features

- move basic functionality into `fastcore.basics`, using minimal imports ([149](https://github.com/fastai/fastcore/issues/149))
- add `anno_dict` and `empty2none` in `meta` ([145](https://github.com/fastai/fastcore/issues/145))

New Features

- add `try_attrs` ([142](https://github.com/fastai/fastcore/issues/142))
- add `filter_dict`, `filter_keys`, and `filter_values` ([140](https://github.com/fastai/fastcore/issues/140))
- add `str2bool` ([138](https://github.com/fastai/fastcore/issues/138))

Bugs Squashed

- `type` fails with `typedispatch` ([144](https://github.com/fastai/fastcore/issues/144))
- `with_cast` fails to cast default values ([139](https://github.com/fastai/fastcore/issues/139))

New Features

- support `store_true` and `store_false` in `fastcore.script` ([137](https://github.com/fastai/fastcore/issues/137))
- add function `otherwise` ([136](https://github.com/fastai/fastcore/issues/136))
- add `pdb` debug flag to scripts ([133](https://github.com/fastai/fastcore/issues/133))
- Update `copy_func` to include required keyword defaults ([134](https://github.com/fastai/fastcore/pull/134)), thanks to [worc3131](https://github.com/worc3131)