These will be needed to implement the dir interruption workaround.

Not yet wired up.

I've separately tested these with ruby-spec, but haven't integrated
it yet for automated testing. Will do it a follow-up commit.

For future reference, here's what I get on my local machine:

```
ruby 3.1.4p223 (2023-03-30 revision 957bb7cb81) [x86_64-linux]
Warming up --------------------------------------
       hold / resume   391.856k i/100ms
Calculating -------------------------------------
       hold / resume      3.829M (± 1.9%) i/s -     38.402M in  10.033530s
```

...that mentions #3450 .

Looks like the `sort:` was added later, and it wasn't particularly
critical to what we were testing so I chose to omit it.

…d by default

This broke Ruby 2.5, which enables it by default.

The interruptions part is just a consequence of signal delivery.

Loic suggested this may provide better compatibility, and it seems
to make sense given we're monkey patching a quite core Ruby class.

This diff is way easier to review without whitespace. What I did was
copy/paste the module, remove the `ruby2_keywords`, add `**kwargs` to
the Ruby 3 variants and clean up any things that don't make sense for
Ruby 3 (e.g. testing for 2.5 for some methods).

…arks

...which I totally was almost forgetting.