Type check with isinstance instead of type() == #1316

	name: dist-check

	on: [push, pull_request]

	jobs:
	dist:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Setup Python
	uses: actions/setup-python@v4
	with:
	python-version: 3.8
	- name: Build dist
	run: \|
	python setup.py sdist
	- name: Twine check
	run: \|
	pip install twine
	last_dist=$(ls -t dist/openml-*.tar.gz \| head -n 1)
	twine check $last_dist
	- name: Install dist
	run: \|
	last_dist=$(ls -t dist/openml-*.tar.gz \| head -n 1)
	pip install $last_dist
	- name: PEP 561 Compliance
	run: \|
	pip install mypy
	cd .. # required to use the installed version of openml
	if ! python -m mypy -c "import openml"; then exit 1; fi

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