Setting aside the arguments for just having reusable linked data JSON-LD in the first place (which is also JSON that a non JSON-LD app can pretty easily consume),
A few questions then are:

Should __json__() be versioned?

Should __json__() return JSON5 (with IEEE 754 ±Infinity and NaN)?

What prevents existing third-party solutions for encoding/serializing/marshalling/dumping and decoding/deserializing/ubmarshalling/loading JSON, JSON5, and JSON-LD from standardizing on e.g. __json__(), __json5__(), and __jsonld11__()?

On Wednesday, August 14, 2019, Andrew Barnert <abarnert@yahoo.com> wrote:
On Aug 14, 2019, at 19:48, Wes Turner <wes.turner@gmail.com> wrote:
>
> Native serialization and deserialization support for either or both JSON5, JSON lines, and JSON-LD would be great to have.

PyPI has packages for all of these things (plus the two not-quite-identical variations on JSONlines, and probably other JSON-related formats as well, not to mention alternative packages for JSON itself that are better for various special uses, like pull-parsing giant docs).

I don’t think that there’s any particular reason any of them need to be included in the stdlib. Especially since at least some of them are still improving at a rate much faster than the stdlib can.

It might make sense for the json module docs to mention some of the related formats. But since none of the packages looks like a category killer, I don’t think that could come with links to specific packages to handle any of them, just descriptions of what they are and why they’re not the same thing as JSON.

And even that might not be necessary. Most people looking for JSON actually do need JSON, not, say, JSON-LD, and people who do need JSON-LD probably know they need it, won’t expect a module called json to provide it, and can go find a library for it themselves.

Still, if Python had the “loose recommendations from core devs” links thing discussed in another thread, some of these packages might qualify. If someone really wants that, they should probably read over what’s been said about it so far and start a separate thread.