document binary format(s)

[aktau]

Hi, I was experimenting with writing a Go trace to Spall converter, and I'm not sure how to convert a number of interesting bits to data into Spall format. Spall format is pretty terse. For example, how do I get a stack-trace in? Those can be a lot larger than 256 bytes.

I perused the repo, and saw there there is something that looks like an expanded (v2?) format. How is one supposed to use (e.g.) the Instant event type? It's not implemented in the upconverter.