thepraandClaude Opus 5.5
a4ced664cf
ConcurrentDictionary.GetOrAdd may run its factory more than once when asked at the same time, and each run started a download: five clients asking at once for a new file made three upstream requests in one run of Clients_asking_at_once_share_one_download. The factory now makes a Lazy, of which only the one kept is ever started, and a download that begins just after another cached the file uses it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw