Overload variables class for better typing experience #1300

	name: test

	on:
	push: # any branch
	pull_request:
	branches: [master]

	env:
	FORCE_COLOR: 1

	jobs:
	test-ubuntu:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	python-version: ["3.7", "3.8", "3.9", "3.10", "3.11", "3.12"]

	steps:
	- uses: actions/checkout@v4
	- name: Setup Python ${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.python-version }}
	allow-prereleases: true
	- name: Install Dependencies
	run: \|
	sudo apt remove python3-pip
	python -m pip install --upgrade pip
	python -m pip install . ruff typos coverage codecov mypy pytest readme_renderer types-contextvars asyncssh
	pip list
	- name: Ruff
	run: \|
	ruff check .
	ruff format --check .
	typos .
	- name: Tests
	run: \|
	coverage run -m pytest
	- if: "matrix.python-version != '3.7'"
	name: Mypy
	# Check whether the imports were sorted correctly.
	# When this fails, please run ./tools/sort-imports.sh
	run: \|
	mypy --strict src/prompt_toolkit --platform win32
	mypy --strict src/prompt_toolkit --platform linux
	mypy --strict src/prompt_toolkit --platform darwin
	- name: Validate README.md
	# Ensure that the README renders correctly (required for uploading to PyPI).
	run: \|
	python -m readme_renderer README.rst > /dev/null
	- name: Run codecov
	run: \|
	codecov

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