Change record status: 
Project: 
Introduced in branch: 
8.4.x
Introduced in version: 
8.4.x
Description: 

This change record is similar to https://www.drupal.org/node/2743809

Whereas that one updates the minimum Symfony requirements to 3.2.6 in composer.lock, this one makes a hard minimum requirement of 3.2.8 in composer.json.

The reason is that a bug was introduced in 3.2.7 and we need to avoid it.

See references to the upstream changes at https://www.drupal.org/node/2887000#comment-12144411, which links to this Symfony issue:

https://github.com/symfony/symfony/pull/22304