Can I specify multiple users for myself in .gitconfig?

Question

Since git 2.13, it is possible to solve this using newly introduced Conditional includes.

An example:

Global config ~/.gitconfig

[user]
    name = John Doe
    email = john@doe.tld

[includeIf "gitdir:~/work/"]
    path = ~/work/.gitconfig

Work specific config ~/work/.gitconfig

[user]
    email = john.doe@company.tld

Remember that [includeIf...] should follows default [user] at the top.