tiny-utf8 VS fuif

I've recently been trying to use the tiny-utf8 library in Rcpp in order to handle unicode, but I am having serious issues trying to understand how the "wrap" part of it works. For the "as" part, I've received some help on Stack Overflow, which works great, but without a wrap(), it seems that I cannot convert the data type into those of Rcpp. I've been reading this post and trying to replicate it, but with utter failure after long hours, due likely to a lack of knowledge in C++ templates. Could someone give some pointers as to how I might go about doing this? I am at the end of my wits at this point.

But they didn't even explain what FUIF or PIK might be in that section or even the entire article!

To understand that article required me searching for FUIF [1], PIK [2] and a brief explanation of what JPEG XL is trying to achieve.

I double down on my "complaint" - I'd call it constructive criticism - that article was poorly written. It's actually quite a good story that their Free Universal Image Format (FUIF) has achieved what it has. That's a great acronym, especially for a world that thinks JPEG XL is a good acronym! Why not put in in the article.

To save anyone else time:

[1] https://github.com/cloudinary/fuif

here is FUIF (one of JXL parents) author writing about benefits of progressive: https://github.com/cloudinary/fuif

There was also an update to it called FUIF - Free Universal Image Format

https://github.com/cloudinary/fuif

But it too got superseded by JPEG XL (.jxl) https://jpegxl.info/