Incompatible with Rails 3.2.3

[sdhull]

! rails c
/Users/sdhull/.rvm/gems/ruby-1.9.3-p194/gems/happymapper-0.4.0/lib/happymapper.rb:6:in `<top (required)>': Boolean is not a class (TypeError)
  from /Users/sdhull/.rvm/gems/ruby-1.9.3-p194/gems/bundler-1.1.4/lib/bundler/runtime.rb:68:in `require'
  from /Users/sdhull/.rvm/gems/ruby-1.9.3-p194/gems/bundler-1.1.4/lib/bundler/runtime.rb:68:in `block (2 levels) in require'
  from /Users/sdhull/.rvm/gems/ruby-1.9.3-p194/gems/bundler-1.1.4/lib/bundler/runtime.rb:66:in `each'
  from /Users/sdhull/.rvm/gems/ruby-1.9.3-p194/gems/bundler-1.1.4/lib/bundler/runtime.rb:66:in `block in require'
  from /Users/sdhull/.rvm/gems/ruby-1.9.3-p194/gems/bundler-1.1.4/lib/bundler/runtime.rb:55:in `each'
  from /Users/sdhull/.rvm/gems/ruby-1.9.3-p194/gems/bundler-1.1.4/lib/bundler/runtime.rb:55:in `require'
  from /Users/sdhull/.rvm/gems/ruby-1.9.3-p194/gems/bundler-1.1.4/lib/bundler.rb:119:in `require'
  from /Users/sdhull/Dev/project/config/application.rb:13:in `<top (required)>'

Just for reference, line 13 of application.rb is:

Bundler.require(*Rails.groups(:assets => %w(development test)))

[sdhull]

Also, I've verified it's not a problem with this version of Ruby itself, as it loads fine in irb.

[sdhull]

Aaaand Google produced a solution: https://github.com/mongoid/mongoid/issues/1107

Of course, all I have to do is change around the order of my Gemfile (require happymapper first)! Silly me. :P

Workaround is OK, but not ideal.