3.4.4

What's Changed

• Fixed lost ask-future completions: NIL replies were silently dropped by tell/cast, leaving ask futures pending forever (also affected task-async with NIL-returning functions). Fixes #119
• New self-contained, thread-safe future/promise implementation in sento.future — completion handlers can no longer race a concurrent resolve. The blackbird dependency has been removed.
• fresult now returns NIL for empty-result completions instead of :not-ready; fawait returns immediately for such futures instead of polling until timeout.
• frecover now propagates conditions that match no handler clause instead of swallowing them.

Full Changelog: 3.4.3...3.4.4