Coder registration doesn't work for types in main module.
Open
bug
core
P2
python
- Dominant language
- Java
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Description
This is because type equality is not preserved through pickling. (Similarly for any other dynamic types that can't be pickled by reference.)
Imported from Jira [BEAM-14250](https://issues.apache.org/jira/browse/BEAM-14250). Original Jira may contain additional context.
Reported by: robertwb.
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