#Needs change record updates

Committed 733dc5f and pushed to 11.x. Thanks!

CR looks great.

CR has been updated.

The CR is no longer correct as the class is not moving. I do think that the CR should exist - it should detail that by default if you use the development.services.yml you will can warnings when saving configuration that does not comply with schema. Once the CR is updated this can be set back to RTBC. The solution looks elegant and it's great that this emits warnings rather than errors.

Re-run seemed to do the trick. Believe all feedback has been addressed

There are test failures. Might need rerunning?

Yeah, might as well, good one.

Nit: add readonly to the promoted properties. Otherwise can RTBC.

+1 from me.

Applied suggestion for grammar and adjusted contructor.

We can decide the namespace, i think this placement is all good.

Added a couple small grammar suggestions.

1 small comment but

Consider adding a todo to move it out of the Testing namespace in D9.

And decide on the namespace. There was an initial suggestion of 'Drupal\Core\Config\Schema\ConfigSchemaChecker'. And later the patch used '\Drupal\Core\Config\Devel\ConfigSchemaChecker', which was changed to '\Drupal\Core\Config\Development\ConfigSchemaChecker'.

Is the current namespace '\Drupal\Core\Config\Development\ConfigSchemaChecker' the one to use or something else?

Is the todo still needed?

Has the namespace been decided?