lostluck opened a new pull request #12903:
URL: https://github.com/apache/beam/pull/12903


   Adds a beam.RegisterDoFn call for users to call on their DoFns instead of 
individually calling RegisterFunction and RegisterType for all parameter types, 
using reflection.
   
   These registrations are important to ensure workers can process and lookup 
types and functions correctly. 
   
   TODO in later PRs:
   * Update starcgen to key off of RegisterDoFn calls for generating type 
assertion shims.
   * Make use of RegisterDoFn everywhere in the GoSDK and examples and document 
it as a best practice.
   
   
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