Delegating to just one line method is to not be worth it.
Avoiding the delegation makes `read_attribute` about 15% faster.

```ruby
ActiveRecord::Schema.define do
  create_table :users, force: true do |t|
    t.string :name
  end
end

class User < ActiveRecord::Base
  def fast_read_attribute(attr_name, &block)
    name = attr_name.to_s
    name = self.class.attribute_aliases[name] || name

    name = @primary_key if name == "id" && @primary_key
    @attributes.fetch_value(name, &block)
  end
end

user = User.create!(name: "user name")

Benchmark.ips do |x|
  x.report("read_attribute('id')") { user.read_attribute('id') }
  x.report("read_attribute('name')") { user.read_attribute('name') }
  x.report("fast_read_attribute('id')") { user.fast_read_attribute('id') }
  x.report("fast_read_attribute('name')") { user.fast_read_attribute('name') }
end
```

```
Warming up --------------------------------------
read_attribute('id')   165.744k i/100ms
read_attribute('name')
                       162.229k i/100ms
fast_read_attribute('id')
                       192.543k i/100ms
fast_read_attribute('name')
                       191.209k i/100ms
Calculating -------------------------------------
read_attribute('id')      1.648M (± 1.7%) i/s -      8.287M in   5.030170s
read_attribute('name')
                          1.636M (± 3.9%) i/s -      8.274M in   5.065356s
fast_read_attribute('id')
                          1.918M (± 1.8%) i/s -      9.627M in   5.021271s
fast_read_attribute('name')
                          1.928M (± 0.9%) i/s -      9.752M in   5.058820s
```