[3.2 compatibility] Fix array slice with arithmetic sequence for Ruby v3.2

[itarato]

#3039

Ruby 3.2 is applying slice with an Enumerator::ArithmeticSequence argument slightly differently: for negative steps and exclusive-ending range the start/end is adjusted in this PR.

Related Ruby core issue: https://bugs.ruby-lang.org/issues/18247

Specs: 7d5bad8#diff-5359533868e5029f9a20bc73cd77a856a8557d94d2726006cd218b14e3c87c4eR787-R881

[andrykonchin]

Any specs covered this new behaviour would be appreciated.

Also could you please point at description of this change (CRuby bug tracker issue, PR or commit in the CRuby reopsitory) - I haven't found any mentioning in the release notes/news? Could it be this one https://bugs.ruby-lang.org/issues/18247?

[itarato]

Any specs covered this new behaviour would be appreciated.

This PR is fixing broken tests for v3.2: 7d5bad8#diff-5359533868e5029f9a20bc73cd77a856a8557d94d2726006cd218b14e3c87c4eR787-R881 These already exist.

Also could you please point at description of this change (CRuby bug tracker issue, PR or commit in the CRuby reopsitory) - I haven't found any mentioning in the release notes/news? Could it be this one https://bugs.ruby-lang.org/issues/18247?

Correct. That's the thread that led to the extra specs.

Anything else should be added?

@andrykonchin

[andrykonchin]

Thank you!

[andrykonchin]

Anything else should be added?

There are some additional steps that are supposed to be done in such PRs:

• to add a changelog record
• to tag/exclude failed specs/MRI tests that are supposed to fail because of new changes (e.g. in [3.2 compatibility] Make an empty hash shift return nil #2980)
• to add files with specs for a new feature to the :next list (in spec/truffleruby.mspec, see guide)

I've done them already for the existing PRs (this one and #2980) so there is nothing to do. The PRs will be merged when pass our internal CI.