Carry the wire reason phrase through buffered and streaming transport,
response conversion, cache, and Window/Worker Fetch and XHR delivery.
Preserve explicitly empty messages, including HTTP/2 and HTTP/3, and
Latin-1 reason bytes while retaining existing synthetic defaults.
Bump cache metadata to version 4 and keep the original status message
when revalidating an entity with a 304 response. Cover transport modes,
cache reloads, response conversions, and streaming XHR state changes.
ldm0
Athul Nambiar