Issue #16221 has been reported by Erik Dalén.

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Bug #16221: Passing undef as argument to classes & defines overrides default 
parameter
https://projects.puppetlabs.com/issues/16221

Author: Erik Dalén
Status: Unreviewed
Priority: Normal
Assignee: 
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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