Stripping expired subkey during export?

[Daniel Kahn Gillmor]

dredging this up from the past:

On Fri 2017-03-03 08:51:57 +0100, Werner Koch wrote:
> As a compatible hack we could add an 'expired' property to the
> export-filter's drop-subkey method.  Just did this:
>
>  gpg --export-options export-clean \
>      --export-filter drop-subkey='expired -t' \
>      --export 1e42b367 
>
> removes all my expired subkeys.  This is just a first step; we also need
> a properties for the key capability.

This is now underway, and will hopefully make it into the next release:

   https://dev.gnupg.org/T4019

   --dkg
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