Enumerable#find_index gives wrong result in case with types cast

[dzjuck]

# Minimal enumerable class
class List
  include ::Enumerable

  def initialize(*items)
    @items = items
  end

  def each(&block)
    @items.each(&block)
  end
end

# Works with array
a = [2]
puts a.find_index(2.0).inspect
#0 # mri
#0 # jruby

# Doesn't work with enumerable
b = List.new(2)
puts b.find_index(2.0).inspect
#0   # mri
# nil # jruby

# Works in another direction
c = List.new(2.0)
puts c.find_index(2).inspect
#0 # mri
#0 # jruby

# Works with comparison in block
d = List.new(2)
puts c.find_index { |i| i == 2.0 }.inspect
#0 # mri
#0 # jruby

Tried with
jruby 1.7.19 (1.9.3p551) 2015-01-29 20786bd on Java HotSpot(TM) 64-Bit Server VM 1.8.0_40-b27 +jit [darwin-x86_64]
jruby 9.0.0.0-SNAPSHOT (2.2.2) 2015-04-18 06c5d29 Java HotSpot(TM) 64-Bit Server VM 25.40-b25 on 1.8.0_40-b27 +jit [darwin-x86_64]
ruby 1.9.3p551 (2014-11-13 revision 48407) [x86_64-darwin13.4.0]
ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-darwin13]

Should i submit specs for this case?

Anybody have ideas how to fix it?

Thank you.

[enebo]

Also fixed on jruby-1_7 in commit f131465