Some info if someone feels like writing docs about this issue:

I've done some digging and the name is correct, however, something like compiled service would also be possible. For those who are not familiar with it: This PR makes it impossible to change a pre-defined service. A predefined service, is a service that is registered in the methodMap property in the container. This is a key value array where the key is the service id, and the value is the method in the container to return that service.

Example:

class SomeContainer extends Container
{
    private $methodMap = [
        'foo.baz' => 'getFoo_BazService',
    ];

    protected function getFoo_BazService()
    {
        return new FooBaz();
    }
    // ...
}

When calling $container->set('foo.baz', ...);, it will now register that service instance internally: $this->services[$id] = $service;. If I understand this PR correctly, 4.0 will no longer make this possible if this service is pre-defined (aka, available in the compiled/extended container).

Correct me if I'm wrong! /cc @nicolas-grekas

Uh oh!

(Un)setting pre-defined services is now deprecated #7464

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