Method swap

ZezeJava/ZezeJava/src/main/java/Zeze/Builtin/Dbh2/BWalk.java:183–187

(BWalk _a_, BWalk _b_)

    }

    public static void swap(BWalk _a_, BWalk _b_) {
        var _s_ = _a_.copy();
        _a_.assign(_b_);
        _b_.assign(_s_);
    }

    @Override
    public long typeId() {