[llvm-bugs] [Bug 42166] New: to_chars can puts leading zeros on numbers

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=42166

            Bug ID: 42166
           Summary: to_chars can puts leading zeros on numbers
           Product: libc++
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: All Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: mclow.lists at gmail.com
                CC: llvm-bugs at lists.llvm.org, mclow.lists at gmail.com

Given the following code:
------
#include <charconv>
#include <iostream>
#include <cassert>

template <typename T>
void test()
{
        char buf[100];
        auto res = std::to_chars(buf, buf + 100, (T)0xffffffff);
        assert(res.ec == std::errc());
        *res.ptr = '\0';
        std::cout << (const char *) buf << std::endl;
}

int main ()
{
        test<int>();
        test<long>();
        test<int64_t>();

        test<unsigned int>();
        test<unsigned long>();
        test<uint64_t>();
}
-----

I expect this to print:
-1
4294967295
4294967295
4294967295
4294967295
4294967295


but instead it prints:
-1
0004294967295
0004294967295
4294967295
0004294967295
0004294967295

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