`<filesystem>`: `exists` returns true for `[file-path]/.`

I suspect that in the following code, exists("test/.") should return false, as the path should refer to directory only.

(I haven't looked into the standard, but gcc and clangs reports assertion failure, and cppreference says v.)

#include<fstream>
#include<filesystem>
#include<cassert>

int main()
{
    using namespace std::filesystem;

    std::ofstream("test") << "test";
    // As expected:
    assert(exists("test"));
    assert(is_regular_file("test"));
    assert(!exists("test/"));

    // But what about these? (Currently they will pass the assertion...)
    assert(exists("test/."));
    assert(is_regular_file("test/."));
}

Start with the provided C++ reproducer and verify the standard’s expected behavior for paths ending in /.. Trace the std::filesystem::exists and is_regular_file entry points, then compare their results with the expected directory-only semantics. Done means the behavior is resolved and the shown case has regression coverage.