owenca wrote:
Had we used `StringRef::contains` initially, would you still insist that it be
replaced with a "more performant" local function? Please note that the code is
not on a performance critical path, and the difference in time it takes to run
the relevant unit tests for 100 times is within a few milliseconds on my
system. For example:
```
time for i in {1..100}; do FormatTests
--gtest_filter=FormatTestComments\.ReflowsComments* > /dev/null; done
```
Before:
```
real 0m1.244s
user 0m1.098s
sys 0m0.123s
```
After:
```
real 0m1.246s
user 0m1.102s
sys 0m0.121s
```
Runtime aside, it's bad for maintainability to hardcode the characters in
`Blanks` in a switch statement when there's library function readily available.
https://github.com/llvm/llvm-project/pull/146245
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