Puppet users - Sep 2014 - "Appending Assignment" (+=) in 3.7/4.0

Hello,

Now that support for += has been removed in 3.7/4.0 
(http://links.puppetlabs.com/remove-plus-equals), is there another way 
to implement "appending assignment" described in 
https://docs.puppetlabs.com/puppet/latest/reference/lang_variables.html#appending-assignment
with the future parser?

     $ssh_users = ['myself', 'someone']

     class test {
       $ssh_users += ['someone_else']
     }


Thanks,

Vlad

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