fix: cast the replaced value as string #45

	name: Tests

	on: [push, pull_request]

	jobs:
	tests:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	php-version:
	- 7.2
	- 7.3
	- 7.4
	- 8.0
	- 8.1
	symfony-version:
	- 4.4.*
	- 5.3.*
	- 5.4.*
	include:
	- php-version: 7.1
	symfony-version: 4.4.*
	- php-version: 8.1
	symfony-version: 6.0.*

	steps:
	- uses: actions/checkout@v2

	- uses: shivammathur/setup-php@v2
	with:
	php-version: ${{ matrix.php-version }}
	coverage: none

	- name: Install symfony version from matrix
	env:
	SYMFONY_VERSION: ${{ matrix.symfony-version }}
	run: composer require symfony/symfony:$SYMFONY_VERSION --no-update
	- name: Install dependencies
	run: composer update --prefer-dist --no-interaction
	- name: Code style check
	run: bin/php-cs-fixer fix --dry-run --using-cache=no --verbose
	- name: Static analysis
	run: bin/phpstan analyse
	- name: Unit tests
	run: bin/atoum

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