Nerixyz wrote:

> prints as `"abc"`. But libc++ and libstdc++ print it as `"abcd"` (which seems 
> like the more correct thing to do?)

This is too MSVC STL/libc++ specific, I think. `std::string` on MSVC's STL 
always has a valid size (regardless of SSO or not) and the test tests that this 
is respected. libc++ should also pass this test, but it currently doesn't, 
because the string is further up in `main.cpp` than expected (you can see that 
it has the expected output before `null_str`, but the check is after 
`null_str`).

https://github.com/llvm/llvm-project/pull/147525
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