004+ (#1) writing e21972b39fd11d17afa533e8f442ff39 = a:1:{s:3:"foo";s:3:"bar";}
004- (#1) writing %s = foo|s:3:"bar";
009+ (#2) writing e21972b39fd11d17afa533e8f442ff39 = a:2:{s:3:"foo";s:3:"bar";s:3:"abc";s:3:"xyz";}
009- (#2) writing %s = foo|s:3:"bar";abc|s:3:"xyz";