[BUG]: nanobind referencing non-existent value __new__ in generated type for enumeration

[breathe]

Problem description

mypy is issuing an error like this when type checking generated type stub:

> mypy
zephyrus/lib/native/zephyrus_native_ext.pyi:675: error: Name "__new__" is not defined  [name-defined]

(the full .pyi file)

import enum


# this code is generated

class SUPLMessage:
    class Type(enum.Enum):
        _new_member_ = __new__

        _use_args_: bool = False

        _member_names_: list = ...

        _member_map_: dict = ...

        _value2member_map_: dict = ...

        _unhashable_values_: list = []

        _value_repr_: None = None

        Empty = 0

        ProvideAssistance = 1

        ProvideCapabilities = 2

        ProvideLocation = 3

        RequestAssistance = 4

        RequestCapabilities = 5

        RequestLocation = 6

Reproducible example code

#pragma GCC diagnostic push

// nanobind uses these extensions.
#pragma GCC diagnostic ignored "-Wshadow"
#pragma GCC diagnostic ignored "-Wzero-length-array"
#pragma GCC diagnostic ignored "-Wnested-anon-types"
#pragma GCC diagnostic ignored "-Wcast-align"

#include <nanobind/nanobind.h>

#include <nanobind/stl/pair.h>
#include <nanobind/stl/tuple.h>
#include <nanobind/stl/string.h>
#include <nanobind/stl/map.h>
#include <nanobind/stl/vector.h>
#include <nanobind/stl/optional.h>
#include <nanobind/stl/unique_ptr.h>
#include <nanobind/eigen/dense.h>

#pragma GCC diagnostic pop

namespace nb = nanobind;

class Message
{
  public:
    enum class Type : uint8_t
    {
        EMPTY,
        PROVIDE_ASSISTANCE,
        PROVIDE_CAPABILITIES,
        PROVIDE_LOCATION,
        REQUEST_ASSISTANCE,
        REQUEST_CAPABILITIES,
        REQUEST_LOCATION,
    };

    virtual ~Message() = default;

    Message(const Message &) = delete;
    auto operator=(Message &) -> Message & = delete;

    Message(Message &&other) noexcept = default;
    auto operator=(Message &&other) noexcept -> Message & = default;

};

NB_MODULE(zephyrus_native_ext, m)
{

    nb::class_<Message> message(m, "SUPLMessage");

    nb::enum_<Message::Type>(message, "Type")
        .value("Empty", Message::Type::EMPTY)
        .value("ProvideAssistance", Message::Type::PROVIDE_ASSISTANCE)
        .value("ProvideCapabilities", Message::Type::PROVIDE_CAPABILITIES)
        .value("ProvideLocation", Message::Type::PROVIDE_LOCATION)
        .value("RequestAssistance", Message::Type::REQUEST_ASSISTANCE)
        .value("RequestCapabilities", Message::Type::REQUEST_CAPABILITIES)
        .value("RequestLocation", Message::Type::REQUEST_LOCATION);
}