ezsystems/ezpublish-kernel — pull request #907 by joaoinacio (2014-06-27 18:12:49+00:00)
Title: Fix: exception messages with double single quotes (''string'')

```InvalidArgumentValue``` exception messages encode string values in single-quotes 2 times,
as var_export() already returns quoted strings.

Fix by not using var_export() for string types.