# Description of Changes

Host-side changes extracted from #3327 

I added AUTO_INC_OVERFLOW even though we don't currently ever return it,
in order to future-proof so it's already there when we start emitting
it.

Prepublish was failing because it was expecting a wasm module
unconditionally, so now it takes ?host_type.

I tweaked JS deser to accept null/undefined when the unit type or an
option type is expected.

I switched to bsatn, because the native sats->js translator wasn't
matching what js was expecting.

I renamed the sys module: my thinking is that `spacetime:` as a scheme
will help disambiguate it, and maybe it could also be used for IMC in
the future or something? And I believe we had discussed wanting this to
be versioned, similar to wasm imports.

Trying to get a borrowed str from deserialize_js doesn't work, because
v8 strings don't store utf8.

# Testing

<!-- Describe any testing you've done, and any testing you'd like your
reviewers to do,
so that you're confident that all the changes work as expected! -->

- [x] All this was done in the course of getting an actual typescript
module to successfully publish.