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> Partial rollout should be by hash on user id

With a per-flag salt as well, otherwise the same user will always have bad luck and be subject to experiments first.

Our in-house solution hashes flagname+key, and LD does the same but adds salt

Better yet require always the same default for boolean flags, so that it's easier to reason about lifecycle for them.

> Start annoying the flag author to delete if the flag is over a month old

No problem, filter that email directly to spam folder.