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8c793aa88b
```ruby
class Post < ActiveRecord::Base
attribute :written_at, default: -> { Time.now.utc }
end
# Rails 6.0
Post.type_for_attribute(:written_at) # => #<Type::Value ... precision: nil, ...>
# Rails 6.1
Post.type_for_attribute(:written_at) # => #<Type::DateTime ... precision: 6, ...>
```
This is an alternative of #39797.
Context https://github.com/rails/rails/pull/39797#issuecomment-655191817.
If people intend to override the existing type on the attribute, usually
an overriding type is explicitly specified, so I agree that the current
behavior (drop existing type information if type is omitted) is
practically quite useless, and it is almost like a bug in that there is
no way to override just the default.
So I'd like to change the current behavior on existing attributes
without a deprecation as a fix.
Closes #39797.
See also https://github.com/kufu/activerecord-bitemporal/pull/57.
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