Method swap

ZezeJava/ZezeJava/src/main/java/Zeze/Builtin/Dbh2/BWalk.java:472–476

(BWalk.Data _a_, BWalk.Data _b_)

    }

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

    @Override
    public long typeId() {