9k.pre1

$ irb
jruby-9.0.0.0-pre1 :001 > require 'active_support/all'
 => true
jruby-9.0.0.0-pre1 :002 > 40.days
 => 40 days

jruby-head

$ irb
jruby-head :001 > require 'json/ext'
 => true
jruby-head :002 > JSON::Ext::Parser
 => JSON::Ext::Parser
jruby-head :003 > require 'active_support/all'
/usr/local/rvm/gems/jruby-head/gems/activesupport-4.2.1/lib/active_support/values/time_zone.rb:37: warning: already initialized constant MAPPING
/usr/local/rvm/gems/jruby-head/gems/activesupport-4.2.1/lib/active_support/values/time_zone.rb:189: warning: already initialized constant UTC_OFFSET_WITH_COLON
/usr/local/rvm/gems/jruby-head/gems/activesupport-4.2.1/lib/active_support/values/time_zone.rb:190: warning: already initialized constant UTC_OFFSET_WITHOUT_COLON
/usr/local/rvm/gems/jruby-head/gems/activesupport-4.2.1/lib/active_support/core_ext/string/output_safety.rb:7: warning: already initialized constant HTML_ESCAPE
/usr/local/rvm/gems/jruby-head/gems/activesupport-4.2.1/lib/active_support/core_ext/string/output_safety.rb:8: warning: already initialized constant JSON_ESCAPE
/usr/local/rvm/gems/jruby-head/gems/activesupport-4.2.1/lib/active_support/core_ext/string/output_safety.rb:9: warning: already initialized constant HTML_ESCAPE_REGEXP
/usr/local/rvm/gems/jruby-head/gems/activesupport-4.2.1/lib/active_support/core_ext/string/output_safety.rb:10: warning: already initialized constant HTML_ESCAPE_ONCE_REGEXP
/usr/local/rvm/gems/jruby-head/gems/activesupport-4.2.1/lib/active_support/core_ext/string/output_safety.rb:11: warning: already initialized constant JSON_ESCAPE_REGEXP
/usr/local/rvm/gems/jruby-head/gems/activesupport-4.2.1/lib/active_support/core_ext/string/output_safety.rb:133: warning: already initialized constant UNSAFE_STRING_METHODS
 => true
jruby-head :004 > 40.days
TypeError: ActiveSupport::Duration can't be coerced into Fixnum
        from org/jruby/RubyFixnum.java:499:in `*'
        from /usr/local/rvm/gems/jruby-head/gems/activesupport-4.2.1/lib/active_support/core_ext/numeric/time.rb:50:in `days'
        from (irb):4:in `<eval>'
        from org/jruby/RubyKernel.java:1005:in `eval'
        from org/jruby/RubyKernel.java:1315:in `loop'
        from org/jruby/RubyKernel.java:1125:in `catch'
        from org/jruby/RubyKernel.java:1125:in `catch'
        from /usr/local/rvm/rubies/jruby-head/bin/irb:13:in `<top>'