Make sure `Unset` class always returns the same instance in ``__new… #2

	name: Tests

	on: [push]

	jobs:
	test:
	name: Test ${{ matrix.python }} - ${{ matrix.os }}
	runs-on: ${{ matrix.os }}

	strategy:
	fail-fast: false
	matrix:
	os:
	- ubuntu-latest
	- windows-latest
	- macos-latest

	python:
	- "3.7"
	- "3.8"
	- "3.9"
	- "3.10"
	- "3.11"
	- "3.12"
	- "pypy3.9"

	steps:
	- uses: actions/checkout@v4

	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python }}

	- name: Install
	run: \|
	pip install coverage
	pip install -e .

	- name: Run tests
	run: \|
	python --version
	python -m node.tests.__init__

	- name: Run coverage
	run: \|
	coverage run --source=src/node --omit=src/node/testing/profiling.py -m node.tests.__init__
	coverage report --fail-under=100

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