v3.4.1
Added Mypy type annotations to the `extensions` directory. (#16083)
Milestone 2.1 (Improve line and branch coverage for the frontend and the backend): Increased coverage in some backend files (#16193)
Apply prettier 2 (#19862)
Fix part of issue #8423 Lint concatenation checker (#19908)
Adds readme to various folders (#8329)
Separate exploration data files from other extensions.
Fix #15567: Python Interpreter Migration from 3.7.10 to 3.8.12 (#15508)