Add django.db.models.base.model_unpickle

[adamchainz]

I have made things!

This is an internal Django function for pickling, but easy to add the types for.

To doublecheck the arg types, I added a breakpoint and ran Django’s test suite:

diff --git a/django/db/models/base.py b/django/db/models/base.py
index 584db319da..7450e2fe7d 100644
--- a/django/db/models/base.py
+++ b/django/db/models/base.py
@@ -2468,6 +2468,7 @@ def model_unpickle(model_id):
     else:
         # Backwards compat - the model was cached directly in earlier versions.
         model = model_id
+    breakpoint()
     return model.__new__(model)

Related issues

Fixes #1207.

[sobolevn]

I trust you on this one, thank you!