Plugin to lookup user by name or email

I needed a way to process a feed that contains user names instead of their Drupal uid (the users were created in a different feeds import that ran before). Searching on internet on how to do that I found this module and decide to write a plugin that does look up a user uid's by name or email. I guess/hope it is generic enough to be added to this module.

Would you consider adding this plugin to your module?

If not, I hope it is useful for others that are looking for this (see e.g. issue #1379344: Import comments with User Name instead of UID .