updating oE nested_get

nested_get

include map.e 
namespace map 
public function nested_get(map the_map_p, sequence the_keys_p, object default_value_p = 0) 

returns the value given a nested key.

Comments:

Returns the value that corresponds to the object the_keys_p in the nested map the_map_p. the_keys_p is a sequence of keys. If any key is not in the map, the object default_value_p is returned instead.

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