due a native (ruby) Set implementation sets now implement (are Java coercible) java.util.Set

due a native (ruby) SortedSet implementation sets now implement (are Java coercible) java.util.SortedSet

Java numbers now seamlessly work on operations where Ruby Integer/Float are expected

e.g. [ java.lang.Integer.new(1), 2 ].pack('S')

the internal (previously deprecated) JavaPackageModuleTemplate has been removed use JavaPackage instead

refactored and deprecated Class#subclasses (from jruby/core_ext.rb)

moved String#unseeded_hash extension (from require 'jruby') to jruby/core_ext/string.rb