Please add big warning that this package should not be included in any non-UTF-8 application or package dependency

[cmanley]

What is this feature about (expected vs actual behaviour)?

Documentation change.

How can I reproduce it?

Does it take minutes, hours or days to fix?

minutes

Any additional information?

This depends on voku/portable-utf8 which simply modifies the applications mb_internal_encoding() to UTF-8 during composer autoload.
Other applications or packages that use this package can now cause data corruption because those using it aren't aware of this behavior.
See voku/portable-utf8#207