`<fstream>`: Potential glitch with `ifstream::peek` in text mode when the file contains LF line endings

Originally reported as DevCom-1628547 and internal VSO-1458783 / AB#1458783 .

C:\Temp>type meow.cpp

#include <cassert>
#include <fstream>
#include <iostream>
using namespace std;

int main() {
    const char* const filename = "example_file.txt";

    {
        ofstream o(filename, ios_base::binary);
        assert(o.good());
        o << "cute fluffy kittens\n";
    }

    ifstream fin(filename);
    assert(fin.good());
    cout << "start pos: " << fin.tellg() << '\n';
    assert(fin.good());
    cout << "fin.peek(): " << static_cast<char>(fin.peek()) << '\n';
    assert(fin.good());
    cout << "end pos (expected 0): " << fin.tellg() << '\n';
}

C:\Temp>cl /EHsc /nologo /W4 meow.cpp
meow.cpp

C:\Temp>meow
start pos: 0
fin.peek(): c
end pos (expected 0): -1

I don't know whether this is by design.

Start by compiling and running the provided C++ reproduction on Windows, focusing on ifstream::peek() and the subsequent tellg() result with LF line endings. Compare the observed position with the expected behavior and determine whether the implementation or a regression test needs updating.