damccorm opened a new issue, #20344:
URL: https://github.com/apache/beam/issues/20344
The above classes are used as return value wrappers, thus when converting
return value annotations to type hints, the argument of these should be used as
the hint.
Example (this should pass but doesn't currently):
```
def test_timestamped_value(self):
def timestamped(e: int) -> beam.window.TimestampedValue[int]:
return beam.window.TimestampedValue(e, 0)
with TestPipeline() as p:
pcoll = p | beam.Create([1,
2, 3]) | beam.Map(timestamped)
self.assertEqual(int, pcoll.element_type)
```
Imported from Jira
[BEAM-10323](https://issues.apache.org/jira/browse/BEAM-10323). Original Jira
may contain additional context.
Reported by: udim.
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