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13 changes: 12 additions & 1 deletion UPGRADE-4.0.md
Original file line number Diff line number Diff line change
Expand Up @@ -163,7 +163,18 @@ DependencyInjection
autowire: true
```

* Autowiring services based on the types they implement is not supported anymore. Rename (or alias) your services to their FQCN id to make them autowirable.
* Autowiring services based on the types they implement is not supported anymore.
It will only look for an alias or a service id that matches a given FQCN.
Rename (or alias) your services to their FQCN id to make them autowirable.
In 3.4, you can activate this behavior instead of having deprecation messages
by setting the following parameter:

```yml
parameters:
container.autowiring.strict_mode: true
```

From 4.0, you can remove it as it's the default behavior and the parameter is not handled anymore.

* `_defaults` and `_instanceof` are now reserved service names in Yaml configurations. Please rename any services with that names.

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