@kares Nice work and specs here!
Could you make a PR against ruby/rubyspec?
That would avoid a possible spec duplication and to test the specs on multiple MRI versions 😃
I can then merge quickly the specs back to jruby master.

@eregon thx, I thought the work-flow is that you pick those eventually back to ruby/rubyspec.
so than I should remove those [rubyspec] commits from here ? ... also not sure how long this would be open before getting merged - maybe its only to be commited after 2.3 final as JRuby 9.1 will come out

@kares For new feature specs I think it's more beneficial to PR against the ruby/rubyspec repo.
Specs for existing stuff is less critical and can more easily be merged later.
Also, this allows to tweak the spec while it's getting stable in MRI.

A guard of minimal version 2.3 will be needed anyway for this spec to pass on older versions, so this spec will only run when JRuby declares RUBY_VERSION to be "2.3.x" (it's possible to ignore such a guard with --unguarded while developing).

Yes, please remove them from here if you do the PR so there is no chance for conflict :)

put the commits into ruby-2.3 which should merge to master after 2.3 final when 9.1.0 is released