castfit 0.1.2 #

With suggestions from Gemini and ChatGPT

castfit 0.1.2 is available. I previously asked both Gemini 2.5 Pro and ChatGPT o3 to review my previous release and provide suggestions. While implementing those suggestions I ended up simplifying several things and making certain interfaces more consistent.

To install castfit:

# modern (recommended)
uv add castfit

# classic
python -m pip install castfit

Release Notes 0.1.2 - 2025-05-21T20:54:51Z #

Fixed

Changed

#14: TypeForm comment to clarify what we want
#19: set instance fields based on class metadata rather than tried to put all the data into the instance
#22: register converters based on both source and destination types rather than assuming that each function must convert everything to a specific destination type
#24: renamed casts_to to casts and added support for short-form (1 argument) cast function
#30: updated the public API to be more compact and consistent

Added

Removed

Won't Fix

#8: Gemini suggested having an explicit caster for pathlib.Path
#9: Gemini suggested having an explicit recursive dataclass/class casting
#10: Gemini suggested optionally collecting errors instead of raising the first one encountered. It's a good idea, but not for now.
#13: Tried implementing a workaround for TypeGuard in older versions of python, but it didn't work.
#23: Started and rolled back is_callable because castfit can't currently do anything with a callable that is the wrong type.
#26: Rolled back having a checks parameter that overrides how types are checked.
#32: Tried fixing TypeForm to be the union of type[T] and _SpecialForm, but only pyright was able to handle it. mypy still can't handle it and ty isn't mature enough yet.