mb_convert_string to 8BIT inconsistent

[aleemb]

Patchwork-UTF8 output is inconsistent with the default PHP implementation of the same.

I ran into this issue while using Laravel which uses the Patchwork library.

I am not sure where exactly the issues lies but hoping someone with more insight can chime in.

[nicolas-grekas]

Thank you for the report, I'll look at that today. Do you have a test case?

[nicolas-grekas]

Not a bug, see tommoor/fastimage#3