Issue #1674 has been updated by Henrik Lindberg.

Target version set to 4.0.0

Case expressions with arrays work when using the future parser (it is mainly a 
parser issue). (I.e. it does not blow up, and it does match arrays with arrays).
Marking this for release in Puppet 4.0

----------------------------------------
Bug #1674: String/array comparisons cause language failures
https://projects.puppetlabs.com/issues/1674#change-98537

* Author: Ryan Steele
* Status: Accepted
* Priority: Normal
* Assignee: 
* Category: language
* Target version: 4.0.0
* Affected Puppet version: 0.24.5
* Keywords: 
* Branch: 
----------------------------------------
If the 'groups' attribute for a user is first stored as a string, but then 
later changed to an array, Puppet throws an exception and complains that it 
can't compare a string to an array.  Here's a trace:

<pre>
/usr/lib/ruby/1.8/puppet/type/user.rb:192:in `sort'
/usr/lib/ruby/1.8/puppet/type/user.rb:192:in `should'
/usr/lib/ruby/1.8/puppet/type/user.rb:320
/usr/lib/ruby/1.8/puppet/metatype/relationships.rb:27:in `instance_eval'
/usr/lib/ruby/1.8/puppet/metatype/relationships.rb:27:in `autorequire'
/usr/lib/ruby/1.8/puppet/metatype/relationships.rb:14:in `eachautorequire'
/usr/lib/ruby/1.8/puppet/metatype/relationships.rb:13:in `each'
/usr/lib/ruby/1.8/puppet/metatype/relationships.rb:13:in `eachautorequire'
/usr/lib/ruby/1.8/puppet/metatype/relationships.rb:22:in `autorequire'
/usr/lib/ruby/1.8/puppet/node/catalog.rb:346:in `relationship_graph'
/usr/lib/ruby/1.8/puppet/node/catalog.rb:345:in `each'
/usr/lib/ruby/1.8/puppet/node/catalog.rb:345:in `relationship_graph'
/usr/lib/ruby/1.8/puppet/transaction.rb:515:in `relationship_graph'
/usr/lib/ruby/1.8/puppet/transaction.rb:511:in `prepare'
/usr/lib/ruby/1.8/puppet/transaction.rb:300:in `evaluate'
/usr/lib/ruby/1.8/puppet/node/catalog.rb:124:in `apply'
/usr/lib/ruby/1.8/puppet/network/client/master.rb:255:in `run'
/usr/lib/ruby/1.8/puppet/util.rb:212:in `benchmark'
/usr/lib/ruby/1.8/benchmark.rb:293:in `measure'
/usr/lib/ruby/1.8/benchmark.rb:307:in `realtime'
/usr/lib/ruby/1.8/puppet/util.rb:211:in `benchmark'
/usr/lib/ruby/1.8/puppet/network/client/master.rb:254:in `run'
/usr/lib/ruby/1.8/sync.rb:230:in `synchronize'
/usr/lib/ruby/1.8/puppet/network/client/master.rb:236:in `run'
/usr/sbin/puppetd:417
err: Got an uncaught exception of type ArgumentError: comparison of String with 
Array failed
debug: Storing state
debug: Stored state in 0.04 seconds
notice: Finished catalog run in 0.18 seconds
</pre>


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