Add narrowing validators #101

	name: Checks
	on:
	pull_request:
	push:
	branches:
	- "master"
	- "v[0-9]"
	jobs:
	checks:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	steps:
	-
	name: Checkout code
	uses: actions/checkout@v2
	-
	name: Setup PHP
	uses: shivammathur/setup-php@v2
	with:
	php-version: 8.2
	-
	name: Install dependencies
	run: composer install --no-progress --prefer-dist --no-interaction

	-
	name: Run checks
	run: composer check

	tests:
	runs-on: ubuntu-latest
	strategy:
	fail-fast: false
	matrix:
	php-version: [ '8.1', '8.2' ]
	dependency-version: [ prefer-lowest, prefer-stable ]
	steps:
	-
	name: Checkout code
	uses: actions/checkout@v2
	-
	name: Setup PHP
	uses: shivammathur/setup-php@v2
	with:
	php-version: ${{ matrix.php-version }}
	-
	name: Update dependencies
	run: composer update --no-progress --${{ matrix.dependency-version }} --prefer-dist --no-interaction
	-
	name: Run tests
	run: composer check:tests

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