on the contrary with the grouping, except for a single loop on TimezoneType to have the grouping, whereas with the second method groupBy, it will take two loops to obtain the result, one which will build the array, and the other for group , look at the code I add two conditions in the existing loop .

I like this proposal because it will probably make this long list more manageable for users. Thanks!

So do I, but it doesn't contain any tests.

@arvodia would you have some time to finish this contribution by adding some test?

You can take inspiration from the existing tests in https://github.com/symfony/symfony/blob/7.1/src/Symfony/Component/Form/Tests/Extension/Core/Type/TimezoneTypeTest.php

Thanks

Closing as there is no more activity on this PR and this cannot be merged without proper tests.