`true.dup` and `false.dup` blow up (Inconsistent with MRI)

[aryeh-looker]

Environment

• jruby-9.1.17.0
• Mac OS X #10.13.3

Expected Behavior

# MRI 2.5.1
2.5.1 :002 > true.dup == true
 => true 

Actual Behavior

jruby-9.1.17.0 :001 > true.dup == true
TypeError: can't dup TrueClass
	from org/jruby/RubyKernel.java:1906:in `dup'
	from (irb):1:in `<eval>'
	from org/jruby/RubyKernel.java:995:in `eval'
	from org/jruby/RubyKernel.java:1316:in `loop'
	from org/jruby/RubyKernel.java:1138:in `catch'
	from org/jruby/RubyKernel.java:1138:in `catch'
	from /Users/user/.rvm/rubies/jruby-9.1.17.0/bin/irb:13:in `<main>'

[enebo]

Ruby 2.3.x displays the error reported so JRuby 9.1.x does not have this issue. Upcoming JRuby 9.2.x will support 2.5.x so it is affected.

[headius]

JRuby 9.2 appears to match Ruby 2.5 behavior here.