zendframework/zf2 — pull request #2034 by RWOverdijk (2012-07-28 16:50:00+00:00)
Title: Fixed offsetSet bug with empty keys

When supplying an empty key on the config, this translated to an empty
string as key.

$config[] = 'a'; became '' => 'a'

My fix makes sure this is handled as expected and thus:
$config[] = 'a'; becomes 0 => 'a'