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Unlike UID revocations which are "reversible" by newer UID
self-signatures, a subkey revocation should be "permanent" even if
followed by a newer self-signature.
The RFC is ambiguous on this, but this is the convention used by (e.g.)
GnuPG. The rationale for this behaviour is available as comments within
the GnuPG source.
UID signatures:
https://github.com/mtigas/gnupg/blob/50c98c7ed6b542857ee2f902eca36cda37407737/g10/getkey.c#L1668-L1674
Subkey signatures:
https://github.com/mtigas/gnupg/blob/50c98c7ed6b542857ee2f902eca36cda37407737/g10/getkey.c#L1990-L1997
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