jurahul wrote:

I have uploaded a new version where the validation is enabled only in debug 
builds, and also added a benchmark for formatv(). On my machine, the benchmark 
results are as follows:

```
Old:
BM_FormatVariadic_mean      3427456 ns      3427426 ns           10

New
BM_FormatVariadic_mean      3360522 ns      3360236 ns           10

New with validation enabled in release builds:
BM_FormatVariadic_mean      3421434 ns      3421426 ns           10
```

So, the new mean is less than the old (with or without validation enabled). My 
takeaway is that the change in time is < measurement noise. In addition, since 
validation is now disabled in release builds, its relatively safe compile time 
perf wise.

I am currently running the CI with ENABLE_VALIDATION, buy @joker-eph can you 
start looking as well? Once the overall change is ok, I still need feedback 
around formatvv(). Given the new setup formatv(false, Fmt, ...) works, and 
since we just have 3 users of formatv() we could just switch to that and not 
invent a new name.

https://github.com/llvm/llvm-project/pull/105745
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