Eli Zaretskii <eliz@gnu.org> schrieb am So., 8. Okt. 2017 um 20:42 Uhr:

>
> I don't think we can bypass decoding in this case; the reason why you
> think it isn't needed is because you only tried that with valid UTF-8
> encoded text.  We never rely on that elsewhere, AFAIK.
>

Jansson only accepts UTF-8 strings, and at least in our usage will also
only hand out UTF-8 strings.
I'd rather not include coding steps: given their complexity, they are very
slow and make the code much more complex than necessary. Since we only deal
with UTF-8 strings, and we can assume that Emacs strings are a superset of
UTF-8 strings, we can completely avoid any coding operations.
It's totally OK to rely on this assumption since all code that's involved
here is part of the Emacs core, so it can rely on implementation details.