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ActiveModel::Errors#merge! allows ActiveModel::Errors to append errors from
a separate ActiveModel::Errors instance onto their own.
Example:
person = Person.new
person.errors.add(:name, :blank)
errors = ActiveModel::Errors.new(Person.new)
errors.add(:name, :invalid)
person.errors.merge!(errors)
puts person.errors.messages
# => { name: ["can't be blank", "is invalid"] }
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