Use attached_object in ruby 3.2+.

[alpaca-tc]

In ruby 3.2+, the method #attached_object is available to search for object of the singleton class.
It is more simple and faster than using ObjectSpace.

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

[JacobEvelyn]

Thanks for making this change @alpaca-tc! This looks great. Since we only run code coverage analysis on the Ruby 3.2 tests, would you mind wrapping :nocov: comments around the else block so the code coverage test passes?

[alpaca-tc]

Added nocov, sorry if I wrote it wrong as I have never written a comment with nocov.

[JacobEvelyn]

That's perfect, thanks! ❤️ If you would be willing to:

• update the README.md with these benchmark results from the latest runs (not sure if you have access to see these: 3.2.2, 2.7.8):

Results using Ruby 3.2.2:

|Method arguments|`Dry::Core`\* (1.0.1)|`Memery` (1.5.0)|
|--|--|--|
|`()` (none)|0.54x|3.62x|
|`(a)`|1.54x|7.74x|
|`(a, b)`|1.29x|5.58x|
|`(a:)`|1.55x|12.37x|
|`(a:, b:)`|1.15x|8.76x|
|`(a, b:)`|1.15x|8.75x|
|`(a, *args)`|0.84x|1.54x|
|`(a:, **kwargs)`|0.79x|2.13x|
|`(a, *args, b:, **kwargs)`|0.69x|1.38x|

\* `Dry::Core`
[may cause incorrect behavior caused by hash collisions](https://github.com/dry-rb/dry-core/issues/63).

Results using Ruby 2.7.8 (because these gems raise errors in Ruby 3.x):

|Method arguments|`DDMemoize` (1.0.0)|`Memoist` (0.16.2)|`Memoized` (1.1.1)|`Memoizer` (1.0.3)|
|--|--|--|--|--|
|`()` (none)|24.22x|2.42x|26.43x|2.70x|
|`(a)`|22.08x|15.19x|22.03x|13.67x|
|`(a, b)`|19.12x|14.01x|18.60x|12.80x|
|`(a:)`|30.21x|24.29x|26.43x|23.11x|
|`(a:, b:)`|27.73x|22.97x|25.11x|21.89x|
|`(a, b:)`|26.87x|22.76x|23.71x|21.26x|
|`(a, *args)`|3.15x|2.30x|3.18x|2.11x|
|`(a:, **kwargs)`|2.89x|2.40x|2.69x|2.28x|
|`(a, *args, b:, **kwargs)`|2.12x|1.82x|1.96x|1.74x|

• squash your commits into one

I'll merge this and release a new version right away.

[codecov]

Codecov Report

Merging #318 (56f6d6f) into main (ed0fb3e) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #318   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         2           
  Lines          177       179    +2     
  Branches        87        88    +1     
=========================================
+ Hits           177       179    +2     

Files	Coverage Δ
lib/memo_wise/internal_api.rb	100.00% <100.00%> (ø)

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[alpaca-tc]

fixed 👍

[JacobEvelyn]

Thanks so much @alpaca-tc and so sorry for the delay! This has now been released in v1.8.0. Thanks for being a contributor!