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Define an unmodifiable empty map
import collections
EmptyDict = collections.namedtuple("EmptyDict", "")
e = EmptyDict()
EmptyDict = collections.namedtuple("EmptyDict", "")
e = EmptyDict()
; Clojure maps are immutable
(def m {})
(def m {})
% Erlang data structures are immutable - updating a 'map' sees a modified copy created
Map = dict:new(),
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