Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

Do you want to freeze a counter to prevent future count changes or bto make it 
to be hashable?  Essentially the only reason we have frozenset is to use sets 
as dict keys to model graphs, but that wouldn't make much sense for counters.

What multiset methods do you need? We already have addition, subtraction, 
union, and intersection.  A symmetric_difference doesn't seem to make sense or 
have a use case.   AFAICT, all that is missing are subset/superset tests which 
were omitted because their semantics conflict with the existing dict equality 
semantics and because the use cases are rare.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40411>
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