Hi, Git Community,

I'm a Git user and curious about a specific aspect of Git's design
regarding the 'user.email' configuration.

Git allows any kind of values without restriction when setting
'user.email' via 'git config' (e.g., `git config user.email
"not-a-valid-email-address"`).

I'm interested in understanding the design philosophy or historical
reasons behind this 'lack' of validation.

I've glanced through the documentations, archived emails, or forum
topics, but couldn't find a definitive or official statement.

Thanks for your time and insights.