Add proper memo_wise initialization for inherited classes

[Galathius]

Hopefully it solves the issue from this comment.

This change should allow such usage:

class BaseClass
  prepend MemoWise
end

class A < BaseClass
  def initialize; end # <--- important part, there is no `super`

  memo_wise def slow
    sleep 2
    puts 'slow result'
  end
end

Now it's failing with:

/Users/galathius/.asdf/installs/ruby/3.2.2/lib/ruby/gems/3.2.0/gems/memo_wise-1.13.0/lib/memo_wise.rb:174:in `slow': undefined method `fetch' for nil:NilClass (NoMethodError)
	from memo_wise_test.rb:26:in `block in <main>'
	from /Users/galathius/.asdf/installs/ruby/3.2.2/lib/ruby/gems/3.2.0/gems/benchmark-0.4.1/lib/benchmark.rb:305:in `measure'
	from memo_wise_test.rb:26:in `<main>'

Before merging:

• Copy the table printed at the end of the latest benchmark results into the README.md and update this PR
• If this change merits an update to CHANGELOG.md, add an entry following Keep a Changelog guidelines with semantic versioning

[Galathius]

Method arguments	memo_wise-github-main (1.13.0)
() (none)	1.00x
(a)	1.00x
(a, b)	0.98x
(a:)	0.99x
(a:, b:)	1.01x
(a, b:)	1.00x
(a, *args)	1.05x
(a:, **kwargs)	0.97x
(a, *args, b:, **kwargs)	1.00x

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (6d82e42) to head (74c4b42).

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #392   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          197       200    +3     
  Branches        89        89           
=========================================
+ Hits           197       200    +3     

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[JacobEvelyn]

Thanks for the PR, @Galathius ! I'm not sure this is right, though—your tests pass even when I remove the def inherited you added, and it appears that CreateMemoWiseStateOnInherited exists to provide this functionality but clearly isn't working correctly. I'll dig and see if I can find a more robust approach.

Edit: I actually don't understand the issue you're encountering; see #382 (comment)

[Galathius]

Hi @JacobEvelyn! Sorry, seems I accidentally removed def initialize; end from the child class in tests.

Just updated it, now if you comment my code in memo_wise.rb you'll see it's failing.