Fix concurrent HTTP component downloads race condition #3050
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Fixes #3048.
I don't love this, to be honest. I want
verified_downloadnot to rely on the assumption that same file name guarantees same file contents, but maybe the cost in weird types (a single case enum, fie) and apologetically long doc comments is hinting to me that you can't always get what you want.Anyway, it appears to work. But if someone would care to gently point out to me the obviously more elegant fix that I've overlooked, I'll be delighted to implement it.