mongoid/mongoid — pull request #2555 by simonx1 (2012-11-15 00:55:47+00:00)
Title: `find` should support _ids of type hash, array etc. 

The problem seems to be in Mongoid Array class extension - method "multi_arged?".
Although Hash instance is "resizable", we should treat it as a single "_id" when passed to "find" method, assuming that "_id" field is type of Hash.

Issue: [#2535]