> And rusqlite (or libsqlite-3) doesn't have those issues?

rusqlite has the same issues. libsqlite doesn't since it's just C bindings. Same as pq_sys. Ironically, rusqlite makes the same design choices as rust-postgres, but it's actually wrapping a heap allocated object anyway, so it gains nothing by doing so...

> I'd probably attempt to change rust-postgres first

I did, too. It turned out to be a pretty major rewrite.