Returns

Bugfixes

- Fixed HKT `to_str` example in documentation
- Fixed backward deserialization compatibility for BaseContainer

Features

- Now requires `mypy>=1.2`

Bugfixes

- Fixes a problem with `do-notation` and type aliases
- Fixes custom pickle protocol to handle `None` values gracefully
- Removes broken drylabs.io link in README
- Revises pointfree documentation

Features

- Adds `do` notation
- Adds `attempt` decorator

Misc

- Check ``__slots__`` correctness with `slotscheck`

New Year Release! 🎄

Features

- Now requires `typing_extensions>=4.0`
- Now requires `mypy>=0.930`
- Removes plugin for `safe`, `maybe`, `future`, etc.
Because we now use `ParamSpec` type to properly type decorators

Bugfixes

- Fixes `__slots__` not being set properly in containers and their base classes
- Fixes patching of containers in pytest plugin not undone after each test

Features

- Enables Pattern Matching support for `Result` containers
- Enables Pattern Matching support for `Maybe` container
- Enables Pattern Matching support for `IOResult` container
- Improves `hypothesis` plugin, now we detect
when type cannot be constructed and give a clear error message
- Adds the option to pass what exceptions `safe` will handle

Features

- Makes `_Nothing` a singleton
- Refactor `flow` function to be faster

Bugfixes

- Fixes that `assert_trace` was not catching containers
from `safe`-wrapped functions

Misc

- Fixes typos in documentation