Thank you for fixing the bugs I reported so quickly. It's very encouraging to report more.

Environment Information

Provide at least:

• JRuby version (jruby -v) and command line (flags, JRUBY_OPTS, etc)

  jruby 9.4.0.0 (3.1.0) 2022-11-23 95c0ec159f OpenJDK 64-Bit Server VM 19.0.1+10 on 19.0.1+10 +jit [x86_64-linux]
  

• Operating system and platform (e.g. uname -a)

  Linux li1544-77 5.13.4-x86_64-linode146 #1 SMP Wed Jul 21 14:45:45 EDT 2021 x86_64 GNU/Linux
  

Expected Behavior

Prints true with this line:

jruby -ve 'p({key: BasicObject.new}.each_value.all?(&:__id__))'

It should be the same as using a block.

jruby -ve 'p({key: BasicObject.new}.each_value.all?{|v|v.__id__})'

Actual Behavior

Block form prints true is expected. With Symbol#to_proc it gives an error:

NoMethodError: undefined method `respond_to?' for #<BasicObject:0x100d0218>
  each_value at org/jruby/RubyHash.java:1630
        each at org/jruby/RubyEnumerator.java:397
        all? at org/jruby/RubyEnumerable.java:1694
      <main> at -e:1
... 5 levels...

Where I hit into this issue, the value was a proxy object which inherits from BasicObject, which has method_missing implemented, therefore it returns true when it's asked with respond_to?, and then it'll be asked with to_ary but then it did not return an array, therefore giving another different error.

The actual code can be found here, where I put a workaround for JRuby: https://github.com/godfat/muack/blob/muack-1.7.0/lib/muack/session.rb#L25-L28

I am not sure why to_ary is needed here, and this might help debug it so I mentioned this.

There are more obscure and weird compatibility issue with JRuby with this library. I'll try to reproduce them with one liners. If you search RUBY_ENGINE == 'jruby' you can find a few of them.

I do recall there's one which Ruby 2.x was giving the same error, but not anymore after Ruby 3.0. I would guess JRuby here continues the behaviour of Ruby 2.x, which is reasonable even though now it should follow the behaviour of 3.0+. Not sure how to reproduce this in one liner yet, but I'll try later.