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ff0204bc7f
- `AM::Error#to_h` was kind of broken before and would return in the
hash values a single error message.
```ruby
person = Person.new
person.errors.add(:name, "cannot be blank")
person.errors.add(:name, "too long")
puts person.errors.to_h # {name: 'too long'}
```
Since an attribute can have different errors, the previous behavior
didn't make much sense.
Now, `ActiveModel::Errors#to_hash` correctly returns an array of
error messages containing all the errors for an attribute.
However, one can easily be surprised by this change, so let's
deprecated it first.
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