How to make email field unique in model User from contrib.auth in Django

Question

I need to patch the standard User model of contrib.auth by ensuring the email field entry is unique:

User._meta.fields[4].unique = True
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Answer 1

Since version 1.2 (May 11th, 2015) there has been a way to dynamically import any chosen registration form using the settings option REGISTRATION_FORM.

So, one could use something like this:

REGISTRATION_FORM = 'registration.forms.RegistrationFormUniqueEmail'

This is documented here.

And here's the link to the changelog entry.