We encountered a bug in dry-types where JRuby does not behave the same way as MRI. I spent some time trying to reproduce it in non-dry-types environment and I think I have a minimal reproducible example now (although still quite convoluted):

class Inner
  def call(input)
    result = input.each_with_object([]) { |x, arr| arr << x * 2 }
    yield(result)
  end
end

class Outer
  def initialize(inner) = @inner = inner

  def call(input, &block)
    @inner.call(input) { |output = input| block.call(output) }
  end
end

input = [1, 2, 3]
p Outer.new(Inner.new).call(input) { |x| x }

On Ruby 3.4.1 it returns [2, 4, 6], while in JRuby it just returns 2.

Environment Information

Provide at least:

• JRuby version: 10.0.2.0
• Operating system and platform : Linux 6.18.6-arch1-1

Expected Behavior

• JRuby and MRI behave the same way, returning [2, 4, 6].

Actual Behavior

• JRuby returns different data structure.