D10 Readiness

https://www.drupal.org/project/typed_data only has ^10 in the 2.0.x dev release. Not seeing any open issues related to D10

https://www.drupal.org/project/dynamic_entity_reference has ^10 in both 3.0.0-beta1 and 4.0.0-alpha1.

The 8.x-1.16 release of https://www.drupal.org/project/key says < 11, but there isn't much happening in issues like #3262761: [META] Drupal 10 compatibility or #3329325: Automated Drupal 10 compatibility fixes.

As more organizations start looking at the upgrade path for D10, it would be helpful to track both the specific issue or general state of project dependencies more closely. Key is actually the project I'm the most concerned about since the maintainers are the least active. Unless someone involved in maintaining the project is going to review updates like https://www.drupal.org/project/key/issues/3329325#comment-14877245, stable dependencies for D10/Salesforce integration will be blocked. There are 12 issues with patches or MR's in a Needs Review state for the Key project. Several of these are related to D10 compatibility, but without #3327909: Create a 1.17 release I don't see how these can move forward without impacting Drupal 9.x.x/Drush 9/Symfony 4 users.

As of 1/21, Key now has an 8.x-1.17 release. I haven't tested it yet and I wish they would fork the D8 and D9/10 branched into a true semver release, but this is progress.

Added an PHP8 issue that will come up since D10 requires PHP 8

Just merged the latest changes from the 5.0.x branch, and fixed multiple test failures on PHP8.1 & D10 (see diff).