Yaroslav Skopets

/test release-notes_api

See https://docs.google.com/document/d/1y5TFhPznEIxXHSI3gF0a98MLIQ4KU6_L1uoYejF3jRw/edit#

I was thinking about returning `HeaderValue` from the `hostcalls`. A typical developer journey starts from ```rust for (name, value) in &request_headers() { println!("{}={}", name, value); } ``` Returning a type...

@PiotrSikora After looking into other use cases, I think, it makes sense to rename `HeaderValue` into `ByteString` and use it everywhere in the API instead of `String`. In particular, `Vec`...