https://github.com/symfony/intl/blob/5.4/Resources/functions.php implements the same intl functions that https://github.com/symfony/polyfill/blob/1.x/src/Intl/Icu/bootstrap.php implements (and probably similar for the various classes, too).
symfony/intl is a dev dependency, I think just in order to verify currencies:
https://github.com/symfony/polyfill/blob/1.x/tests/Intl/Icu/CurrenciesTest.php
On PHP versions that can't load symfony/intl after 5.4, this means that in some scenarios tests are running against symfony/intl's deprecated intl polyfills instead of Intl\Icu's, and there are implementation differences between them.
https://github.com/symfony/intl/blob/5.4/Resources/functions.php implements the same intl functions that https://github.com/symfony/polyfill/blob/1.x/src/Intl/Icu/bootstrap.php implements (and probably similar for the various classes, too).
symfony/intl is a dev dependency, I think just in order to verify currencies:
https://github.com/symfony/polyfill/blob/1.x/tests/Intl/Icu/CurrenciesTest.php
On PHP versions that can't load symfony/intl after 5.4, this means that in some scenarios tests are running against symfony/intl's deprecated intl polyfills instead of
Intl\Icu's, and there are implementation differences between them.