[libcxx-commits] [libcxx] [libc++] LWG2381: Inconsistency in parsing floating point numbers (PR #77948)

[via libcxx-commits]

bgra8 wrote:

@mordante this patch causes strings like ".5" to no longer parse and this is most likely a bug.

Here's a small reproducer:

```
#include <sstream>
#include <cassert>

int main(int , char** ) {
  std::istringstream strm(".5");
  float val = 0;
  strm >> val;

  assert(!strm.fail());
  assert(strm.eof());
  assert(val == .5);
  return 0;
}
```

Can you please take a look?

https://github.com/llvm/llvm-project/pull/77948