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+immutables
+==========
+
+An immutable mapping type for Python.
+
+The underlying datastructure is a Hash Array Mapped Trie (HAMT)
+used in Clojure and other functional languages.  The actual
+implementation is copied from CPython 3.7 (see PEP 567 and
+the contextvars module.)
+
+
+License
+=======
+
+Apache 2.0