Issue #15329 has been updated by Andrew  Parker.

My biggest concern around changing this is the possible impact on existing 
code. If anyone somehow relied on this insane behavior, then changes that make 
it much more straightforward might end up breaking all of that. We need to 
avoid that situation.

So what is a way that we can get the semantics we want with a minimal (or at 
least very clearly understandable) break of existing code?
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Bug #15329: Puppet lacks a proper "undefined" value
https://projects.puppetlabs.com/issues/15329#change-69468

Author: Pieter van de Bruggen
Status: Accepted
Priority: High
Assignee: Pieter van de Bruggen
Category: 
Target version: 
Affected Puppet version: 
Keywords: 
Branch: 


    $y = undef
    notice($y == "")  # true
    notice($x == $y)  # true
    notice($x == "")  # true

Recent changes in the Puppet DSL made equality commutative (good!), but in 
doing so broke work-arounds for actually testing for the difference between an 
undefined and "empty" value.  The most logical fix would be to equate Puppet's 
`undef` with Ruby's `nil`.


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