>    The idea is that as long as the challenge status is still "pending", the
>    server is still retrying.  Once it gives up, it marks the challenge as
>    "invalid".
Bad idea. This prevents a server from supporting retries unless it
commits to continuously reverifying the challenge itself. A server may
want to allow retries but require a client to retrigger it (which is the
most consistent with the initial behaviour of challenges anyway).

Options here would be to add a new status, or an additional boolean
field indicating whether proactive retries are being made.

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