Environment

Provide at least:

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

jruby 9.2.0.0-SNAPSHOT (2.4.1) 2018-01-05 2d48da9 Java HotSpot(TM) 64-Bit Server VM 25.144-b01 on 1.8.0_144-b01 +jit [darwin-x86_64]

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

Darwin Charless-Air 16.7.0 Darwin Kernel Version 16.7.0: Mon Nov 13 21:56:25 PST 2017; root:xnu-3789.72.11~1/RELEASE_X86_64 x86_64

Expected Behavior

• Describe your expectation of how JRuby should behave, perhaps by showing how CRuby/MRI behaves.

MRI returns true for each attached test print.

JRuby returns false for the to_a test print.

• Provide an executable Ruby script or a link to an example repository.

require 'set'

set1 = SortedSet[1, 2]

set2 = set1.dup

puts "expect different objects, [#{set1.object_id != set2.object_id}]"

puts "expect same contents, [#{set1 == set2}]"

puts "expect same length, [#{set1.size == set2.size}]"

puts "expect same to_a, [#{set1.to_a == set2.to_a}]"