Announcement issue for plugin API changes

The mypy plugin interface is experimental, unstable, and prone to change. In particular, there are no guarantees about backwards compatibility. Backwards incompatible changes may be made without a deprecation period.

We will, however, attempt to announce breaking changes in this issue, so that plugin developers can subscribe to this issue and be notified.

Breaking changes fall into three broad categories:

1. Changes to the actual plugin API itself
2. Changes to parts of the "implicit plugin API"---that is, internals that plugins are likely to use (representation of types, etc).
3. Changes to things that really aren't plausibly part of the plugin API (but, of course, that some plugins might be using anyway...)

Issues in category 1 will be consistently announced here, issues in category 3 will probably be announced here only if problems are reported, and issues in category 2 will be somewhere in the middle.

Es wird keine Repository-Datei, kein Test und kein Einstiegspunkt genannt. Lies den Issue-Text und die Ankündigungen zur plugin API; es gibt keine durch die Implementierung definierte Abschlussbedingung, daher behandle ihn als Tracker ausschließlich zu Informationszwecken und nicht als ersten Beitrag.