beast::async_detect_ssl does not take lvalue arguments in Boost 1.70 RC2

[KABoissonneault]

Someone posted this snippet on Slack, saying it doesn't compile

#include <boost/beast/core.hpp>

using boost::asio::ip::tcp;
namespace beast = boost::beast;
void good(tcp::socket & socket, beast::flat_buffer & buf)
{
    beast::async_detect_ssl(socket, buf, [](beast::error_code ec, bool uses_ssl){});
}

void bad(tcp::socket & socket, beast::flat_buffer & buf)
{
    
    auto h = [](beast::error_code ec, bool uses_ssl){};
    beast::async_detect_ssl(socket, buf, h);
        /* error: beast/core/detect_ssl.hpp:513:25: error: type ‘boost::beast::async_base<<lambda(boost::beast::error_code, bool)>&, boost::asio::executor, std::allocator<void> >’ is not a direct base of ‘boost::beast::detail::detect_ssl_op<<lambda(boost::beast::error_code, bool)>, boost::asio::basic_stream_socket<boost::asio::ip::tcp>, boost::beast::basic_flat_buffer<std::allocator<char> > >’
        */
}

I suspect this is because of the constructor of detect_ssl_op

template<class DetectHandler_>
    detect_ssl_op(
        DetectHandler_&& handler,
        AsyncReadStream& stream,
        DynamicBuffer& buffer)
        : beast::async_base<
            DetectHandler_,
            beast::executor_type<AsyncReadStream>>(
                std::forward<DetectHandler_>(handler),
                stream.get_executor())
        , stream_(stream)
        , buffer_(buffer)

async_base here is instantiated with DetectHandler_, which is not decayed, while the base class uses the decayed handler