Explicitly bind names in __init__.py

[tucked]

Resolve #1879

This is just a start... I have a presentation to give at 4PM PDT, then I'll come back and spend more time with this.

• fixes #

Checklist:

• Add tests that demonstrate the correct behavior of the change. Tests should fail without the change.
• Add or update relevant docs, in the docs folder and in code.
• Add an entry in CHANGES.rst summarizing the change and linking to the issue.
• Add .. versionchanged:: entries in any relevant code docs.
• Run pre-commit hooks and fix any issues.
• Run pytest and tox, no tests failed.

[davidism]

This is noisy, I don't plan to make this change. You can add the following config to your project to allow Click (or other packages) to do this, it's a very common pattern. I suggest you have further discussion with mypy about the strictness of this, it sounds like they're open to it or may already have an open issue about it.

[mypy-click]
no_implicit_reexport = False

[tucked]

may already have an open issue about it

Looks like python/mypy#10198 applies.