Breaking API changes

• Lwt_result.catch now takes a function (unit -> 'a t) rather than a promise ('a t). (#965)
• Remove the deprecated Lwt.result type (use Stdlib.result instead). (#968)
• Remove the deprecated Lwt.make_value and Lwt.make_result functions (use Ok and Error instead). (#968)
• Remove the deprecated and unsafe waiter_of_wakener (keep the waiter around when you create the wakener instead). (#968)
• Remove the deprecated Lwt_stream.on_termination and Lwt_stream.on_terminate (bind to Lwt_stream.closed instead). (#968)
• Remove the deprecated Lwt_stream.result type (use Stdlib.result instead). (#968)
• Remove the deprecated Lwt_stream.map_exn function (use wrap_exn instead). (#968)

Additions

• Lwt.Exception_filter for enabling/disabling system-exception catching. (#964)
• Lwt.reraise an exception raising function which preserves backtraces, recommended for use in Lwt.catch. (#963)
• Expose Lwt_io.delete_recursively for deleting a directory and its content recursively. (#984, Antonin Décimo)
• Lwt_preemptive.run_in_main_dont_wait to run a function in the main preemptive thread but without waiting for the result. (Kate Deplaix, #960)
• Lwt_unix.handle_signal and Lwt_engine.forwards_signal to allow other IO libraries (such as Eio) to share signal handlers. (Thomas Leonard, #993, #991)

Build

• Remove unused dependency in dune file. (#969, Kate Deplaix)
• Fix some compilation warnings for C stubs with OCaml 5. (#976, Antonin Décimo)

Fixes

• Use SA_ONSTACK on OCaml5 to avoid SIGSEGV. (Thomas Leonard, #993, #981)
• Fix race in worker loop. (Thomas Leonard, #993, #994)
• Fix marshall header size in Lwt_io.read_value. (Simmo Saan, #995)

Misc

• Resolve paused promises only once in main loop. This lets Lwt.pause behave identical to Lwt_unix.yield. (#917, Christopher Zimmermann, Favonia)