How would folks feel about adding a Pants mypy plugin for internal and plugin-author-external usage? The motivation is to remove the

frozen_after_init

requirement and add field converters, a la

attrs

. (I'm also starting a discussion in the Typing-SIG about making a PEP for converter, wish me luck lol) The downside is VS Code (or other type-checkers/type-checker-powered-environments) lose out on the info