[development] performance foo

[Chris Johnson]

I just did the same tests on the inverse routine, array2object() versus cast 
(object).  The cast appears to be 4 times faster:

10000 'array2object' calls took 4.38 seconds.
The average was 0.00043776 seconds per call.

10000 'cast object' calls took 1.05 seconds.
The average was 0.00010541 seconds per call.

Rolling more patches.  See Issue #41169 (http://drupal.org/node/41169).