mattbaird/gochimp — pull request #1 by jefferai (2013-08-09 18:42:13+00:00)
Title: Don't use default parameters for booleans as they'll override default settings on the site.

For instance, when automatic conversion to text is
selected on Mandrill, not including the auto_text parameter explicitly
in your data structure locally will cause false to be sent, overriding
the default (if it's set to true). So, mark them as omitempty instead.