Frozen model still allows attribute changes

[kaorukobo]

Summary

The model including ActiveAttr::Model should reject attribute changes by throwing FrozenError after#freeze is called.

Reproduction

require "bundler/inline"
gemfile(true) do
  gem "active_attr", git: "https://github.com/cgriego/active_attr.git"
  gem "rspec"
end

require "rspec/autorun"

class Foo
  include ActiveAttr::Model
  attribute :qux
end

RSpec.describe do
  it "raises FrozenError" do
    foo = Foo.new.freeze
    expect {
      foo.qux = "grault"   # ==> does not throw FrozenError!
    }.to raise_error(FrozenError)
  end
end

Behavior of ActiveModel::Model

ActiveModel::Model does not allow attribute changes.
I think it is an ideal behavior.

require "bundler/inline"
gemfile(true) do
  gem "activemodel"
  gem "rspec"
end

require "rspec/autorun"
require "active_model"

class Foo
  include ActiveModel::Model
  attr_accessor :qux
end

RSpec.describe do
  it "raises FrozenError" do
    foo = Foo.new.freeze
    expect {
      foo.qux = "grault"
    }.to raise_error(FrozenError)
  end
end