v0.4.26.1 — Python-only follow-up on 4.26

0.4.26.1 (2026-04-23)

Python-only follow-up on 0.4.26. Still alpha — APIs may change.

Fixes

• Slack native streaming: SlackAdapter.stream() no longer calls
  AsyncWebClient.chat_stream(...) without await. The unawaited coroutine
  returned a truthy object, and the first streamer.append(...) raised
  AttributeError, breaking native Slack streaming for any consumer using
  the default adapter. Issue #44.
• Teams divider renders at non-zero height: empty Container with
  separator: True rendered as zero-height in the Teams UI. Dividers
  between siblings now hoist separator: True onto the following element;
  a trailing divider emits a minimal non-empty Container. Issue #45.
• ConcurrencyConfig.max_concurrent is now enforced: consumers setting
  concurrency=ConcurrencyConfig(strategy="concurrent", max_concurrent=N)
  now actually get an asyncio.Semaphore(N) cap on in-flight handlers.
  Previously the field was accepted and ignored (upstream TS has the same
  gap). None / unset keeps the unbounded default. Issue #51.

Python-specific (divergence from upstream 4.26)

• Fallback streaming runtime robustness (cluster of fixes): framework-
  agnostic request.text() handling now tolerates sync Flask-style
  requests (was raising TypeError: object is not awaitable). Handlers
  typed Callable[..., Awaitable[None] | None] may return sync (None) —
  the dispatcher now awaits only when inspect.isawaitable() confirms,
  preventing runtime crashes on sync handlers.
• max_concurrent enforcement (see above) — upstream accepts the
  config field but never enforces it; we do.

New public APIs

• Chat.thread(thread_id, *, current_message=None): new worker-
  reconstruction factory mirroring TS chat.thread(threadId). Adapter is
  inferred from the thread-ID prefix; state and message history come from
  the Chat instance. current_message is preserved so Slack native
  streaming still works post-reconstruction. Issue #46.
• SlackAdapter.current_token / current_client: public @property
  accessors for the request-context-bound bot token and a preconfigured
  AsyncWebClient. Replaces underscore access from consumer code making
  direct Slack Web API calls inside a handler (email resolution, user
  profile fetches, etc.). Issue #47.

Internals

• Pyrefly: 213 → 0 type errors; baseline file removed. CI now enforces
  zero errors. Root causes fixed: 8-adapter lock_scope: LockScope | None
  protocol conformance; _ChatSingleton as Protocol; submodule-aware
  replace-imports-with-any; NoReturn on error re-raisers;
  inspect.isawaitable guards for duck-typed request handling and
  sync-or-async handler dispatch. No Any widening, no new # type: ignore lines beyond 10 at adapter event-construction sites where
  thread=None/channel=None get re-wrapped by Chat before handler
  dispatch (matches upstream TS's Omit<> partial-event pattern).
• Test count: 3545 passed, 2 skipped.

Known gaps (not fixed in this release)

• onOptionsLoad handler for dynamic select dropdowns — issue #50
• Thread.getParticipants() method — issue #54
• rehydrate_attachment adapter hook for queue/debounce + attachments —
  issue #52
• 40 upstream tests without Python equivalents (Options Load, Plan variants,
  StreamingPlan options, getParticipants) — issue #53
• Discord native Gateway WebSocket (HTTP-only today) — issue #57
• Teams certificate-based mTLS auth — issue #58
• Google Chat file uploads (TODO upstream too) — issue #59
• Global handler-dispatch bound across reactions/actions/slash/modals — issue #61