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DOCUMENTATION:
  name: combine
  version_added: "2.0"
  short_description: combine two dictionaries
  description:
    - Create a dictionary (hash/associative array) as a result of merging existing dictionaries.
  positional: _input, _dicts
  options:
    _input:
      description: First dictionary to combine.
      type: dict
      required: true
    _dicts:  # TODO: this is really an *args so not list, but list ref
      description: The list of dictionaries to combine.
      type: list
      elements: dictionary
      required: true
    recursive:
      description: If C(True), merge elements recursively.
      type: bool
      default: false
    list_merge:
      description: Behavior when encountering list elements.
      type: str
      default: replace
      choices:
        replace: overwrite older entries with newer ones
        keep: discard newer entries
        append: append newer entries to the older ones
        prepend: insert newer entries in front of the older ones
        append_rp: append newer entries to the older ones, overwrite duplicates
        prepend_rp: insert newer entries in front of the older ones, discard duplicates

EXAMPLES: |

    # ab => {'a':1, 'b':3, 'c': 4}
    ab: {{ {'a':1, 'b':2} | ansible.builtin.combine({'b':3, 'c':4}) }}

    many: "{{ dict1 | ansible.builtin.combine(dict2, dict3, dict4) }}"
    
    # defaults => {'a':{'b':3, 'c':4}, 'd': 5}
    # customization => {'a':{'c':20}}
    # final => {'a':{'b':3, 'c':20}, 'd': 5}
    final: "{{ defaults | ansible.builtin.combine(customization, recursive=true) }}"

RETURN:
  _value:
    description: Resulting merge of supplied dictionaries.
    type: dict