On Fri, Aug 9, 2019 at 4:41 AM Jeff King [off-list ref] wrote:

On Thu, Aug 08, 2019 at 08:07:36PM -0700, Phil Hord wrote:

quoted

The long form you give there is to be used in case the old email
address is not a unique key. See 'git help shortlog'.

The problem we have at work is that one woman's old email address
includes her deadname, like [off-list ref].  I will
leave it up to her whether she chooses to be listed explicitly in the
mailmap.  I have wondered if we should permit hashed email addresses
to be used for this specific case, but this also has its drawbacks.

Since the set of hash inputs is finite and small (i.e., the set of all
emails in the repository), it would be trivial to generate the plaintext
mapping from even a cryptographically strong hashed mapping.

Which isn't to say it's _totally_ worthless, since that adds an extra
step, but it really is just obfuscating the data.

Yes, obfuscation is all I expect. Someone who needs deeper scrubbing
will need to rewrite their history instead.