* Use .extend from ArrayVec

* Bench Vec<u8> as Output

* Add size_hints and introduce WrapperType.

* Remove redundant Compact implementations.

* Add docs and more size_hints.

* Add some more detailed docs for read.

* Update src/codec.rs

Co-Authored-By: tomusdrw <tomusdrw@users.noreply.github.com>

* Address review grumbles.

* Make note a header.

* Bring back optimized impls for empty types, use faster Output to ArrayVec