https://gitlab.synchro.net/main/sbbs/-/merge_requests/442#note_5390
I suspect with this change, textIsUTF8 will *always* be `true`. Are you actually seeing messages with subjects that are *not* valid UTF-8?
All ASCII strings are valid UTF-8, while not all UTF-8 strings are valid ASCII.
You probably mean to write something more like this:
```
str_is_ascii(str) === false && str_is_utf8(str) === true
```
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