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→map:new
The two-argument form of the function returns a ''map'' that is formed by combining the contents of the maps supplied in the <code>$maps</code> argument. The collation of the new map is the value of the <code>$coll</code> argument. The supplied maps are combined as follows:
# There is one entry in the new map for each distinct key value present in the union of the input maps, where keys are considered distinct according to the rules of the <code>distinct-values</code> function with <code>$collationcoll</code> as the collation.
# The associated value for each such key is taken from the last map in the input sequence <code>$maps</code> that contains an entry with this key. If this map contains more than one entry with this key (which can happen if its collation is different from that of the new map) then it is ''implementation-dependent'' which of them is selected.
