Incorrect tuple_size if type contains native array member

[wingfiring]

Reproduce:

struct Foo { int x[2]; };

gcc: 13.2.0 compile command: g++ -std=c++20 a.cpp -Ipath/to/boost

Expect: expects(boost::pfr::tuple_size_v<Foo> == 1); Actual: boost::pfr::tuple_size_v<Foo> == 2

Workaround(might be problematic, but works for me):

diff --git a/include/boost/pfr/detail/fields_count.hpp b/include/boost/pfr/detail/fields_count.hpp
index 8d1354e..04bb89c 100644
--- a/include/boost/pfr/detail/fields_count.hpp
+++ b/include/boost/pfr/detail/fields_count.hpp
@@ -150,11 +150,11 @@ constexpr void* assert_first_not_base(std::index_sequence<>) noexcept
 ///////////////////// Helper for SFINAE on fields count
 template <class T, std::size_t... I, class /*Enable*/ = typename std::enable_if<std::is_copy_constructible<T>::value>::type>
 constexpr auto enable_if_constructible_helper(std::index_sequence<I...>) noexcept
-    -> typename std::add_pointer<decltype(T{ ubiq_lref_constructor{I}... })>::type;
+    -> typename std::add_pointer<decltype(T{ {ubiq_lref_constructor{I}}... })>::type;

 template <class T, std::size_t... I, class /*Enable*/ = typename std::enable_if<!std::is_copy_constructible<T>::value>::type>
 constexpr auto enable_if_constructible_helper(std::index_sequence<I...>) noexcept
-    -> typename std::add_pointer<decltype(T{ ubiq_rref_constructor{I}... })>::type;
+    -> typename std::add_pointer<decltype(T{ {ubiq_rref_constructor{I}}... })>::type;

 template <class T, std::size_t N, class /*Enable*/ = decltype( enable_if_constructible_helper<T>(detail::make_index_sequence<N>()) ) >
 using enable_if_constructible_helper_t = std::size_t;

[apolukhin]

The patch breaks multiple tests. It requires some additional tweaking, I'd appreciate a PR.