How to apply directory dependent git configuration using conditional imports (#tilPost)

I just came across Marcus Crane's post Conditionally setting your gitconfig. Marcus explains how to use conditional includes and apply directory dependent git configuration.

Here's an example from his blog post:

[user]
  email = user@example.com
  name = User
  signingkey = ABC123
[commit]
  gpgSign = true
[includeIf "gitdir:~/work/"]
  path = ~/.work.gitconfig

The git docs describe that you include configs depending on branch name, too.

I don't need different git configurations these days, but it's good to know this feature exists. ?