Non-ASCII character in header file

[thestumbler]

I noticed a warning on libserialport.h when compiling with VS2019. Digging deeper, I saw that the bash utility file reports the format as UTF-8, whereas all the other header and source files are reported as ASCII. Digging even deeper, it seems that in line 233, the leading letter s in the word sets:

* any time. If your existing code sets @c O_NONBLOCK, you should use

is not actually an s, but rather Unicode point u0455, which is the Cyrillic small letter DZE.
This letter displays as a normal Latin letter s, so it isn't obvious at first glance.

Is this a glitch?

-Chris