Issue #16221 has been updated by eric sorenson.

Status changed from Unreviewed to Investigating
Assignee set to eric sorenson
Keywords changed from parameter,undef to parameter undef

This seems more correct to me--you are intentionally setting the parameter to 
'undef'. I need to investigate to make sure that this was the result of a 
deliberate change and document if so.
----------------------------------------
Bug #16221: Passing undef as argument to classes & defines overrides default 
parameter
https://projects.puppetlabs.com/issues/16221#change-70407

Author: Erik Dalén
Status: Investigating
Priority: Normal
Assignee: eric sorenson
Category: 
Target version: 3.0.0
Affected Puppet version: 3.0.0-rc5
Keywords: parameter undef
Branch: 


In puppet 3.0.0-rc5 the default value is overridden if I pass undef as a 
parameter to a define or class.

Example:

    define bar ($param='Hello world') {
      notice($param)
    }
    define foo ($param=undef) {
      bar { 'bartest': param => $param }
    }
    foo { 'footest': }

In puppet 2.7.19 that outputs:
    notice: Scope(Bar[bartest]): Hello world
    
But in puppet 3.0.0-rc5 I get:
    Scope(Bar[test]): 


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