Valentyn Tymofieiev created BEAM-10217:
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             Summary: Suboptimal type inference on Python 3.6
                 Key: BEAM-10217
                 URL: https://issues.apache.org/jira/browse/BEAM-10217
             Project: Beam
          Issue Type: Bug
          Components: sdk-py-core
            Reporter: Valentyn Tymofieiev


Following test fails for me with AssertionError:  :: List[Tuple[Person, int]] 
!= List[Any] on Python 3.6.8; Passed on 3.5.2, 3.5.6 and 3.7.3. 

{noformat}
  def testMethodReturnsTuple(self):
    class Person(object):
      def __init__(self, name):
        self.name = name

    def parse_record(name_and_age):
      name, age = name_and_age.split(',')
      return Person(name), int(age)

    self.assertReturnType(typehints.List[typehints.Tuple[Person, int]],
                          lambda record: [parse_record(record)], [str])
{noformat}



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