[jorenham]

Hi there :)

At first I was planning on improving static type coverage here, but I then noticed that you were still supporting two EOL Python versions: Python 3.9 has been end of life (EOL) since 2025-10-31, and Python 3.10 since 2026-10-01. They don't receive any security updates anymore, aand without them, the type annotations can be written using modern typing syntax, which helps a lot for readability. So I figured that improving type coverage would be a lot easier if I'd just drop these EOL Python versions first, so here I am :)

A consequence of the new 3.11 lower bound is that ruff check started reporting 149 new (pyupgrade) errors. I auto-fixed most of them using ruff check --fix, leaving 4 errors that I had to fix by hand. These required marking type aliases with TypeAlias so that mypy understands that e.g. "Figure | Div | Popup" is a type expression, rather than a string constant.

When I ran ruff and mypy locally, they seemed happy. I wasn't able to run all pytest tests though; The test failures were mostly in tests/selenium and tests/snapshots , and also one in tests/test_repr. But as far as I can tell, these failures seem unrelated to this PR.

[jorenham]

The CI failure seems unrelated (something to do with https://leafletjs.com/examples/extending-1-classes/ now 404-ing)