make mypy succeed in strict mode #1

	name: Typing Check

	on:
	push:
	paths:
	- '**.py'
	pull_request:
	paths:
	- '**.py'

	jobs:
	mypy:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout code
	uses: actions/checkout@v4

	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: '3.9' # oldest supported python version

	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	pip install .[dev]

	- name: Run mypy
	run: mypy

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