1.14.0

• motoko (moc)

  • feat: Structural implicit derivation now supports variants via the __variant combiner ((Text, () -> E) -> R).
    The synthesized wrapper switches on the active case and applies the combiner to its (tag, payload thunk),
    deriving operations like serialization for any variant whose case payloads have instances (#6192).

  • feat: the default maximum for stable memory (--max-stable-pages) is now 100 GiB
    (was 4 GiB), raising the default ceiling for the Region library.
    Override with --max-stable-pages <n> as before (#6279).

  • bugfix: implement the new Candid subtyping rule service <actortype> <: principal
    (dfinity/candid#748): service references now decode at type Principal, both when
    decoded directly and in deferred subtype checks on function references (#6275).

  • bugfix: a class in expression position lowered to unit instead of its
    constructor (#6291).

  • bugfix: a self tail call whose argument is a tuple-returning expression
    crashed the compiler (or miscompiled, with the IR check off) (#6292).