Change `exp_val` and `ndigits` to use literal `"auto"` instead of `AutoExpVal` and `AutoDigits` #689

	# This workflow will install Python dependencies, run tests and lint with a variety of Python versions
	# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-python

	name: Python package

	on:
	push:
	branches: [ "main" ]
	pull_request:
	branches: [ "main" ]

	jobs:
	build:

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

	steps:
	- uses: actions/checkout@v4
	- name: Set up Python ${{ matrix.python-version }}
	uses: actions/setup-python@v5
	with:
	python-version: ${{ matrix.python-version }}
	cache: 'pip'
	- name: Install dependencies
	run: \|
	python -m pip install --upgrade pip
	python -m pip install -e .[dev]
	- name: Lint/format source code and docs
	run: \|
	ruff check .
	ruff format . --check
	- name: Test source code and docs
	run: \|
	coverage run -m unittest
	coverage report
	coverage xml
	python -m sphinx -b doctest docs/source/ docs/build/doctest/
	- name: Upload coverage reports to Codecov
	uses: codecov/codecov-action@v4
	with:
	token: ${{ secrets.CODECOV_TOKEN }}
	flags: ${{ matrix.python-version }}
	files: coverage.xml
	fail_ci_if_error: true
	verbose: true

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