Non ASCII header values causes panic

[x1125]

I came here via an unexpected panic in my tide webserver, but I think the problem belongs here.
When I'm using a cookie that might be a bit "odd" like password=Â , the calling library (async-h1 or tide) is calling append_header from request.rs, then append and insert within the headers/headers.rs file to set that header. On line 54 it says:
let values: HeaderValues = values.to_header_values().unwrap().collect();
which fails and panics with a Result::unwrap() on an Err value: String slice should be valid ASCII.
I think those functions should have a result of type Result<T, E> if these functions can fail in such circumstances.

[Fishrock123]

In the past, http-rs held tight to disallowing things disallowed by existing http rfcs.

However in RFC 9110 "HTTP Semantics" (June 2022) under the "Field Values" (5.5) section it says:

Specifications for newly defined fields SHOULD limit their values to visible US-ASCII octets (VCHAR), SP, and HTAB. A recipient SHOULD treat other allowed octets in field content (i.e., obs-text) as opaque data.

To me this sounds as if http-rs treats this incorrectly. Instead of causing an error, the RFC indicated non-ascii octets should generally be preserved in some way, at least as i read it.

[OneOfOne]

this is fixed in OneOfOne@82270e7