astropy/astropy — pull request #665 by eteq (2013-01-25 06:30:06+00:00)
Title: Document list and tuple behavior in ConfigurationItem's defaultvalue

Passing a `list` or `tuple` in to `ConfigurationItem` as the default value means something special to the configuration system. This should be documented under __Developer Usage__ on the main docs page for `astropy.config`.

cc @eteq