* Add CompactSize64 and CompactSizeMessage types
But don't remove read_compactsize and write_compactsize yet.
* Fix CompactSize capitalisation
```sh
fastmod compactSize CompactSize zebra* book
fastmod compactsize CompactSize zebra* book
```
* Make CompactSize patterns consistent with integer lengths
* Replace unwrap_err with asserting is_err
Co-authored-by: Janito Vaqueiro Ferreira Filho <janito.vff@gmail.com>
* Replace a panic with an assertion
* Make generic serialization use CompactSizeMessage
* Fix type inference and borrow-checker errors
* Doctest fixes
Co-authored-by: Janito Vaqueiro Ferreira Filho <janito.vff@gmail.com>
teor