Issue #16116 has been reported by Nick Fagerlund.

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Bug #16116: Arrays and hashes are mutable; new members can be added and 
existing values changed
https://projects.puppetlabs.com/issues/16116

Author: Nick Fagerlund
Status: Unreviewed
Priority: Normal
Assignee: 
Category: 
Target version: 
Affected Puppet version: 
Keywords: 
Branch: 


Courtesy Henrik: Puppet doesn't let you reassign variables within a given 
scope, but it lets you change the values of hashes and arrays by mucking with 
their members. That seems wrong. 

    $myary = ['zero', 'one', 'two']
    $myhash = {first => 'one', second => 'two', third => 'three'}

    $myary[3] = 'three' #can insert new element 
    $myary[3] = 'something else' #can reassign
    notice($myary[3])

    $myhash[fourth] = 'four' #can insert new element
    $myhash[fourth] = 'something else' #can't reassign, fails compilation
    notice($myhash[fourth])

    $myary += ['four'] #can't append in same scope, fails compilation

AND it's inconsistent, so obviously SOMETHING is whacked, even if we actually 
do want these objects to be mutable.

I don't know what we should do about this. I think the extent to which this is 
being used in the wild is completely unknown. 


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