Including sjson (formerly (ice-9 json)) and fash.scm in guile proper?

[Christopher Allan Webber <cwebber@dustycloud.org>]

Hello!

So a while ago, David Thompson submitted (ice-9 json) to Guile proper.
A few changes were requested, so it hadn't made it in.  In the meanwhile
I began using it for a number of projects.  I also added some
modifications and extensions: #nil became 'null for the representation
of null values, the representation got a bit easier to read for deeply
nested lists-of-dicts-of-lists-of-dicts (moved from '(@ (key . val)) to
'(@ (key val)) after some discussion with David Thompson), I added a
pretty printer, and I also added fash support, snarfing fash.scm from
Andy Wingo (I had a number of cases where I had json documents with a
*lot* of key / value pairs and I was operating on them, and being able
to read/write from a constant time datastructure as an option was
needed).

I released this as an independed library, which is even now packaged in
Guix as guile-sjson.

However, I wonder if we should package this in Guile proper.  There is
still one issue to resolve iirc, I should add more specific exception
names.

The biggest problem to me seems that we would also want to include
Wingo's fash.scm in Guile proper.  Personally, I think this would be a
big win: highly performant immutable hashmaps are desirable (and though
we have vhashes, setting an existing value keeps the old value, and are
not as fast as fashes in my experience).

So:
 - Are Guile's developers open to having an (ice-9 fash) module?
 - And should I submit (ice-9 json), with my changes?

Thanks!
 - Chris