The BUGS section of utf8 to which you linked begins with the qualification

Some filesystems may not support ...

I take that to mean that the behaviour you have encountered may well be dependent upon the filesystem type. It is probably worth verifying that before suggesting a fix which itself might break other things (eg. on other filesystems). If you have an SSCCE to illustrate the problem, I'm sure other monks (me included) would be happy to run your test case on other filesystems to see how they behave.

🦛

In reply to Re: utf8::downgrade() and file system operators by hippo
in thread utf8::downgrade() and file system operators by hexcoder

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