Comment by camgunz
5 months ago
> But MP's inability to store anything more than (u)int64 and float64 does make its data model technically different from JSON....
Yeah I don't love the MP/JSON comparison the site pushes. I don't really think they solve the same problems, but the reasons are kind of obscure so shrug. MP is quite different from JSON and yeah, numbers is one of those ways.
> [1] Correct floating point formatting and parsing is very difficult and needs a non-trivial amount of precomputed tables and sometimes bignum routines (depends on the exact algorithm)---for the record I'm the main author of Rust's floating point formatting routine. Also for this reason, most language-standard libraries already have a hidden support for size-limited bignums!
Oh man yeah tell me about it; I attempted this way back when and gave up lol. I was doing a bunch of research into arbitrary precision libraries and the benchmarks all contain "rendering a big 'ol floating point number" and that's why. Wild.
> I mean, the supposed processability is already a poorly defined metric as I wrote earlier. I too suppose that it would be entirely up to the application's (or possibly library's educated) request
I think in practice implementations are either heavily spec'd (FIDO) on top of a restricted subset of CBOR, or they control both sender and receiver. This is why I think much of the additional protocol discussion in CBOR is pretty moot; if you're taking the CBOR spec's advice on protocols you're not building a good protocol.
> Oh man yeah tell me about it; I attempted this way back when and gave up lol. I was doing a bunch of research into arbitrary precision libraries and the benchmarks all contain "rendering a big 'ol floating point number" and that's why. Wild.
Yes, it is a stuff that people generally don't even realize its existence. To my knowledge only RapidJSON and simdjson seriously invested in optimizing this aspect---their authors do know this stuff and difficulty. Others tend to use a performant but not optimal library like double-conversion (which was the SOTA at the time of release!).