From: Eric Wong <normalperson@...>
Date: 2015-07-28T20:21:28+00:00
Subject: [ruby-core:70159] Re: [Ruby trunk - Bug #11396] Bad performance in ruby >= 2.2 for Hash with many symbol keys

Thanks for testing.  A backporter will backport it to 2.2 since this
is a regression.

I am also working on more improvements, rb_objid_hash seems weak.