Symfony polyfill backporting some PHP 8.0+ features to lower PHP versions

 This component provides features added to PHP 8.0 core:
 .
  * Stringable interface
  * fdiv
  * ValueError class
  * UnhandledMatchError class
  * FILTER_VALIDATE_BOOL constant
  * get_debug_type
  * PhpToken class
  * preg_last_error_msg
  * str_contains
  * str_starts_with
  * str_ends_with
  * get_resource_id
  * Attribute class
 .
 The Symfony Polyfill project backports features found in the latest PHP
 versions and provides compatibility layers for some extensions and functions.
 It is intended to be used when portability across PHP versions and extensions
 is desired.
 .
 Symfony is a PHP framework, a set of tools and a development methodology.