allClients concatenates two shapes: cfg.oidc.clients comes through the
submodule and carries every option default, hiveClients is a raw attrset
built in the let block with four fields. renderClient read
tokenEndpointAuthMethod plainly, which is fine for a declared client and
an eval error for a derived one -- so all-local, where hiveIdentities is
on, stopped evaluating.
Read it with `or null`. The comment records that the list is not
uniformly typed, because the next field added to that submodule has the
same trap waiting.
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