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→map:merge
| Constructs and returns a new map. The ''map'' is formed by combining the contents of the supplied {{Code|$maps}}. The maps are combined as follows:
# There is one entry in the new map for each distinct key present in the union of the input maps.
# The {{Code|$options}} argument defines how duplicate keys are handled. Currently, a single option {{Code|duplicates}} exists, and its allowed values are {{Code|use-first}}, {{Code|use-last}}, {{Code|use-combine}} and {{Code|reject}}.
|-
| '''Examples'''
