fetch now makes every request through an http.Client with a time
limit, ten minutes by default and set with --timeout, which must be
greater than zero. A connection error, a timeout, or a 5xx or 429
response is retried, up to five tries in all, after a random wait
whose limit doubles from one second, or after the wait the server's
Retry-After asks for, up to one minute. Each try of a file starts a
new temp file, so a retry never keeps a partial file; the size and
hash checks are unchanged. Manifest and file URLs are built with
URL.JoinPath, so trailing slashes, query strings and names that need
escaping all work.
Model: opus-5-5
sneak