RXminuS commented on issue #26493:
URL: https://github.com/apache/beam/issues/26493#issuecomment-1826172994

   @tvalentyn I'm not quite understanding what you mean. I think this issue is 
more referring to the fact that it doesn't really seam possible to set the 
return type of a expand to be either a Tuple or a TaggedPCollection so that you 
get typed outputs for each of the keys/indexes.
   
   I'm stuck on this as well breaking both static typing with a warning
   ```
   WARNING  | apache_beam.typehints.decorators:strip_pcoll_helper:381 - This 
output type hint will be ignored and not used for type-checking purposes. 
Typically, output type hints for a PTransform are single (or nested) types 
wrapped by a PCollection, PDone, or None. Got: 
Tuple[apache_beam.pvalue.PCollection[XXX], apache_beam.pvalue.PCollection[YYY]] 
instead.
   ```
   
   Nor can I perform runtime type-checking correctly


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