Jira (PUP-10726) hiera lookup removes duplicate array elements during deep merge

Title: Message Title

Puppet Version: 6.19.0
Puppet Server Version: not installed
OS Name/Version: Ubuntu 20.04

hiera lookup removes duplicate array elements during deep merge.

hiera.yaml:

version: 5

defaults:

  data_hash: yaml_data

  datadir: data

hierarchy:

  - name: 'level1'

    path: level1.yaml

  - name: 'level2'

    path: level2.yaml

data/level1.yaml:

test:

  array:

- 1

- 1

- 2

data/level2.yaml:

lookup_options:

  test:

    merge: 'deep'

test: {}

puppet lookup --explain test:

Searching for "lookup_options"

  Global Data Provider (hiera configuration version 5)

    No such key: "lookup_options"

  Environment Data Provider (hiera configuration version 5)

    Using configuration "/home/rvicinus/.puppetlabs/etc/code/environments/production/hiera.yaml"

    Merge strategy hash

      Hierarchy entry "level1"

        Path "/home/rvicinus/.puppetlabs/etc/code/environments/production/data/level1.yaml"

          Original path: "level1.yaml"

          No such key: "lookup_options"

      Hierarchy entry "level2"

        Path "/home/rvicinus/.puppetlabs/etc/code/environments/production/data/level2.yaml"

          Original path: "level2.yaml"

          Found key: "lookup_options" value: {

            "test" => {

              "merge" => "deep"

      Merged result: {

        "test" => {

          "merge" => "deep"

Using merge options from "lookup_options" hash

Searching for "test"

  Merge strategy deep

    Global Data Provider (hiera configuration version 5)

      No such key: "test"

    Environment Data Provider (hiera configuration version 5)

      Using configuration "/home/rvicinus/.puppetlabs/etc/code/environments/production/hiera.yaml"

      Merge strategy deep

        Hierarchy entry "level1"

          Path "/home/rvicinus/.puppetlabs/etc/code/environments/production/data/level1.yaml"

            Original path: "level1.yaml"

            Found key: "test" value: {

              "array" => [

1,

1,

        Hierarchy entry "level2"

          Path "/home/rvicinus/.puppetlabs/etc/code/environments/production/data/level2.yaml"

            Original path: "level2.yaml"

            Found key: "test" value: {}

        Merged result: {

          "array" => [

1,

    Merged result: {

      "array" => [

1,

Desired Behavior:

Return array with all 3 values: [ 1, 1, 2 ]

Actual Behavior:

Returns array with only unique values: [ 1, 2 ]

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