bug#31138: Native json slower than json.el

[Dmitry Gutov]

On 23.04.2019 13:38, Eli Zaretskii wrote:
> > It's special in the sense that both the JSON RFC and Jansson require
> > UTF-8 for interchange, so we don't have to deal with raw bytes and can
> > assume all text is UTF-8-encoded.
> We agreed to disagree about this long ago.  Can we please stop arguing
> about this time and again?

Even if we don't intend to trust Jansson on this, returning valid UTF-8 
is in the contract. So it should be perfectly reasonable to discard any 
invalid UTF-8 strings it returns and signal an error, rather than try to 
somehow decode them.

Leading to easier to follow code, for one thing. Right now it's not 
obvious that the "else" branch should never be taken in practice.

At this point I'm out of arguments. It is, of course, your call.