rails/rails — pull request #15780 by sgrif (2014-06-17 20:17:43+00:00)
Title: Don't assume that Hstore columns have always changed

HStore columns come back from the database separated by a comma and a
space, not just a comma. We need to mirror that behavior since we
compare the two values.

Also adds a regression test against JSON to ensure we don't have the
same bug there.