Jira (PUP-8182) Lookup unique merge doesn't deduplicate with a single layer

Title: Message Title

Johnson Earls created an issue

PUP-8182

Ticket

~~PUP-7608~~ was created against Puppet 5.0. This same issue also affects Puppet 4, and is a behavioral change from earlier Puppet 4 versions.

Given a single hiera file containing

---

foo:

  - this is a test

  - this is another test

  - this is a test

In Puppet 4.2.3, hiera_array("foo") will return a two-element array:

$ puppet apply -t --noop -e '$foo = hiera_array("foo"); notice("${::clientversion}: ${foo}")'

Info: Loading facts

Info: Loading facts

Info: Loading facts

Notice: Scope(Class[main]): 4.2.3: [this is a test, this is another test]

Notice: Compiled catalog for puppet01-am3.am3.responsys.com in environment production in 0.32 seconds

Info: Applying configuration version '1510798433'

Notice: Applied catalog in 0.02 seconds

However, in Puppet 4.10.8, it returns all three elements, including the duplicated element:

$ puppet apply --strict=off -t --noop -e '$foo = hiera_array("foo"); notice("${::clientversion}: ${foo}")'

Info: Loading facts

Info: Loading facts

Info: Loading facts

Notice: Scope(Class[main]): 4.10.8: [this is a test, this is another test, this is a test]

Notice: Compiled catalog for foo.example.com in environment production in 0.13 seconds

Info: Applying configuration version '1510798413'

Notice: Applied catalog in 0.04 seconds

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