When using bsd sed that ships with macOS on the object files for
comparison, every command would error with
```
sed: RE error: illegal byte sequence
```
This was potentially fixed for an older version in
6c52b02e7d0df765da608d8119ae8a20de142cff but even the commands in the
example there still have this error. You can repro this with any binary:
```
$ sed s/a/b/ /bin/ls >/dev/null
sed: RE error: illegal byte sequence
```
Where LC_CTYPE appears to no longer solve the issue:
```
$ LC_CTYPE=C sed s/a/b/ /bin/ls >/dev/null
sed: RE error: illegal byte sequence
```
But this change with LC_ALL does:
```
$ LC_ALL=C sed s/a/b/ /bin/ls >/dev/null; echo $?
0
```
It seems like the difference here is that if you have LC_ALL set to
something else, LC_CTYPE does not override it. More info:
https://stackoverflow.com/a/23584470/902968
51e0a997ca