Raymond Hettinger added the comment:
The decision was deliberate and matches what we've done elsewhere in Python.
The nearest kin to Counters are sets/frozensets which also behave the same way:
>>> class S(set):
pass
>>> type(S('abc') | S('cdef'))
<class 'set'>
Mark Dickinson articulated the reasons clearly. Python has been consistent
about this decision from the outset (see array.array or fractions.Fraction for
example).
Marking this as "not a bug" and closing.
----------
resolution: -> not a bug
status: open -> closed
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue25535>
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