Re: [PATCH v4 0/3] use mailmap by default in git log

> Even though I personally think it is an OK longer-term end goal, the
> execution looks too hasty.  The normal way we handle a big behaviour
> change like this is to do the following in steps, in different
> releases:
>
>  - In the first release, introduce an early adoptor option (say
>    log.usemailmap) that can be turned on by the user, but is off by
>    default.  IOW, the initial step is "no change in behaviour,
>    unless you ask for it".  This step also makes sure that the way
>    to disable it for those who opt into the option from the command
>    line (i.e.  the --no-use-mailmap option) works well.
>
>  - In the second release, when "git log" is run without command line
>    "--[no-]use-mailmap" and "log.usemailmap" is not set by the user,
>    give warning about an upcoming flipping of the default, with an
>    advice message that the user can squelch the warning by setting
>    the option.
>
>  - In the final release, flip the default and remove the warning.
>
> Usually there needs sufficient time between the second step and the
> third step, so that people will not miss the warning.