coleifer/peewee 3.3.3 on GitHub

More efficient implementation of model dependency-graph generation. Improves performance of recursively deleting related objects by omitting unnecessary subqueries.
Added union(), union_all(), intersect() and except_() to the Model-specific query implementations. This was an oversight that should have been patched in 3.3.2, but is fixed in 3.3.3.
Major cleanup to test runner and standardized test skipping logic to integrate with standard-library unittest conventions.