Users can't be really destroyed

[artplan1]

When I'm trying to really_destroy! user I receive:

Traceback (most recent call last):
        2: from (irb):18
        1: from app/models/spree/user_decorator.rb:62:in `scramble_email_and_password'
RuntimeError (Can't modify frozen hash)

Line 62 is:

self.email = 'deleted_' + SecureRandom.uuid.first(5) + email

What if we move scramble_email_and_password to before_destroy callback and don't call save in it?