drnic/composite_primary_keys — pull request #123 by tism (2012-09-25 00:27:54+00:00)
Title: Update ActiveRecord::Base#initialize_dup override in line with ActiveRec...

...ord::Base 3.2.5+

initialize_attributes is included from ActiveRecord::AttributeMethods::Serialization and since 3.2.5 accepts
an options hash which can control whether or not the attributes are initialized serialized or unserialized.

This fixes issue #119, however it will make things incompatible with ActiveRecord < 3.2.5. Not sure how version support should be handled here.