rails/activemodel/CHANGELOG.md

• Fix has_secure_password. password_confirmation validations are triggered even if no password_confirmation is set.

  Vladimir Kiselev

• inclusion / exclusion validations with ranges will only use the faster Range#cover for numerical ranges, and the more accurate Range#include? for non-numerical ones.

  Fixes range validations like :a..:f that used to pass with values like :be. Fixes #10593

  Charles Bergeron

• Fix regression in has_secure_password. When a password is set, but a confirmation is an empty string, it would incorrectly save.

  Steve Klabnik and Phillip Calvin

• Deprecate Validator#setup. This should be done manually now in the validator's constructor.

  Nick Sutterer

Please check 4-0-stable for previous changes.