Issue #6621 has been updated by Nigel Kersten.

Hah. I appreciate your concern for my well-being :) but it's much more 
important we have something usable :)

I've gotten trapped by this a few times, but there's always been a reasonable 
way out, and since we introduced the Ruby DSL, you're free to incorporate 
manifests that use the actual nil
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Feature #6621: Provide a nil type in the Puppet language
https://projects.puppetlabs.com/issues/6621

Author: Oliver Hookins
Status: Unreviewed
Priority: Normal
Assignee: 
Category: 
Target version: 
Affected Puppet version: 2.6.5
Keywords: 
Branch: 


Currently there is no way to semantically convey the concept of nil, as Ruby 
understands it.

nil currently evaluates to true and is internally converted to a string 'nil', 
and '' evaluates (somewhat confusingly) to false. However, the empty string is 
a permissible configuration value whereas nil inherently is not. Furthermore 
non-empty strings evaluate to true unlike the empty string.

My use case, to put it very simply, is to work around some limitations of 
communicating information between the external node classifier interface and 
Puppet itself, since once you pass a nil value through the interface to Puppet, 
nil loses its semantic value.


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