IOTypeHints: merge None and ((), {}) into one value
Open
core
improvement
P3
python
- Dominant language
- Java
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Description
See https://github.com/apache/beam/pull/9283/files#r317829250 for discussion
Imported from Jira [BEAM-8154](https://issues.apache.org/jira/browse/BEAM-8154). Original Jira may contain additional context.
Reported by: udim.
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