Fix Python 3.14 compatibility for typing.Union annotations

Handle object with __file__ attribute having a None value (issue #2082)

fix: prevent C extension stdout writes from corrupting subprocess IPC

Add Python 3.14 into CI configuration

Don't remove `sys.path[0]`.

limit columns to line_length

Explicit sphinx config path

perf: optimize transitions and path handling using sets

Support dataclass transform

Fix for #2044