Fix `tick` delta type handling #154

	name: CI

	on:
	- pull_request
	- push

	jobs:
	mypy:
	name: mypy
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version:
	- '3.7'
	- '3.8'
	- '3.9'
	- '3.10'
	- '3.11'
	- '3.12'

	steps:
	- uses: actions/checkout@master

	- name: Set up Python
	uses: actions/setup-python@v4

	- name: Install dependencies
	run: \|
	pip install mypy
	pip install -r requirements.txt

	- name: Run MyPy
	run: mypy --install-types --non-interactive

	tests:
	name: Python ${{ matrix.implementation }}${{ matrix.python-version }}
	runs-on: ubuntu-latest
	strategy:
	matrix:
	python-version:
	- '3.7'
	- '3.8'
	- '3.9'
	- '3.10'
	- '3.11'
	- '3.12'
	implementation:
	- '' # CPython
	- 'pypy' # PyPy
	exclude: # unreleased;
	- implementation: 'pypy'
	python-version: '3.10'
	- implementation: 'pypy'
	python-version: '3.11'
	- implementation: 'pypy'
	python-version: '3.12'

	steps:
	- uses: actions/checkout@master

	- name: Set up Python ${{ matrix.implementation }}${{ matrix.python-version }}
	uses: actions/setup-python@v4
	with:
	python-version: ${{ matrix.implementation }}${{ matrix.python-version }}

	- name: Install tox
	run: pip install tox

	- name: Run tests
	run: pip install python-dateutil && tox -e py

Provide feedback