0.14.0

• motoko (moc)

  • Add .values() as an alias to .vals() for arrays and Blobs (#4876).

  • Support explicit, safe migration of persistent data allowing arbitrary
    transformations on a selected subset of stable variables.
    Additional static checks warn against possible data loss (#4812).

    As a very simple example:

    import Nat32 "mo:base/Nat32";
    
    (with migration =
      func (old : { var size : Nat32 }) : { var length : Nat } =
        { var length = Nat32.toNat(old.size) }
    )
    persistent actor {
      var length : Nat = 0;
    }
    

    may be used during an upgrade to rename the stable field size to length,
    and change its type from Nat32 to Nat.

    See the documentation for full details.