- Added `bytes!` constructor macro which acts similar to `vec![element; count]`
- Thread-safety tests for `ByteArray` through static assertions for `Send+Sync+Unpin+Sized`

- Marked `fill_zeros` for deprecation and is to be renamed to `with_zeros` in the future
- Marked `fill_with` for deprecation and is to be renamed to `with_value` in the future