NOTE: if you use guild's autocomplete functionality, you will need to re-install the completion scripts, as they have changed. It should be sufficient to run `guild completion --install`. - Add Pydantic typing information to the core data structure classes. This is used to generate a schema for the guildfile. - Add python-based autocompletion implementation. Bash behavior has not changed, but more completions should now work on zsh and fish. - Add support for BooleanOptionalAction from argparse in Python 3.9+ - Removes deprecated flags support - Update click dependency to >=8.1 Fixes: - Get tests working with Python 3.10 - Fix issue with guild init where python version was ignored - Rename flags() attribute of Run class to guild_flags(), to avoid conflict with pandas >=1.2