twisted.python.filepath.FilePath and related classes (twisted.python.filepath.IFilepath, twisted.python.filepath.AbstractFilePath, twisted.python.zippath.ZipPath, and twisted.python.zippath.ZipArchive) now have type annotations. Additionally, FilePath is now generic, describing its mode, so you can annotate variables as FilePath[str] or FilePath[bytes] depending on the types that you wish to get back from the 'path' attribute and related methods like 'basename'. (#11822)
When using CPython, functions wrapped by twisted.internet.defer.inlineCallbacks can have their arguments and return values freed immediately after completion (due to there no longer being circular references). (#11885)

Bugfixes

Fix TypeError on t.i.cfreactor due to 3.10 type annotation syntax (#11965)
Fix the type annotations of DeferredLock.run, DeferredSemaphore.run, maybeDeferred, ensureDeferred, inlineCallbacks and fromCoroutine that used to return Deferred[Any] to return the result of the passed Coroutine/Coroutine function (#11985)
Fixed significant performance overhead (CPU and bandwidth) when doing small writes to a TLS transport. Specifically, small writes to a TLS transport are now buffered until the next reactor iteration. (#11989)
fix mypy due to hypothesis 6.85 (#11995)

Improved Documentation

The search and version navigation for the documentation hosted on Read The Docs was fixed. This was a regression introduced with 23.8.0. (#12012)

Drop support for Python 3.7. Remove twisted[contextvars] extra (contextvars are always available in Python 3.7+) (#11913)

#5206, #11583, #11787, #11871, #11912, #11921, #11922, #11926, #11932, #11934, #11936, #11938, #11940, #11942, #11945, #11948, #11952, #11953, #11955, #11957, #11959, #11961, #11964, #11973, #11977, #11980, #11982, #11993, #11999, #12004, #12005, #12009

No significant changes.

Bugfixes ~~~~~~~~

In Twisted 16.3.0, we changed twisted.web to stop dispatching HTTP/1.1 pipelined requests to application code. There was a bug in this change which still allowed clients which could send multiple full HTTP requests in a single TCP segment to trigger asynchronous processing of later requests, which could lead to out-of-order responses. This has now been corrected and twisted.web should never process a pipelined request over HTTP/1.1 until the previous request has fully completed. (CVE-2023-46137, GHSA-cq7q-gv5w-rwx2) (#11976)

Deprecations and Removals ~~~~~~~~~~~~~~~~~~~~~~~~~

No significant changes.

No significant changes.

No significant changes.

Misc ~~~~