astroid is very dynamic and very hard to type. A lot of effort went into typing it, and mypy is still not activated (#1287). It prevents automated error detection in pylint and it prevent most performance possibility that always start with proper typing, be it mypyc, a partial rewrite in a rust crate (#2014) or cython.

I'm opening this discussion so we can discuss the breaking changes we need to do to make it easier to type astroid in the future.