Symfony version(s) affected

6.2.8

Description

With #49187 the return value of extraFields have changed, if it's not the uidKey or passwordAttribute.

Before this PR each key was treated as single value and returned as that. Now each key which is not one of the above is treated as a multi value.

How to reproduce

Load an user and add "mail" attribute as extraField.

Old Behavior: single value
New behavior: multi value

Possible Solution

• Updating the Upgrade Docs
• Define single/multi valued keys

Additional Context

No response