lostluck commented on PR #23589:
URL: https://github.com/apache/beam/pull/23589#issuecomment-1276505094

   Yeah! It was deep in internal google for years too. I'm glad it's been 
exported.
   
   There are actually two versions, one at "internal/singleflight" in the 
standard library and one as a separate module (the one being used). The latter 
allows faster bug fixes, such as a recent race condition resolution. They're 
otherwise API compatible, but generally it's nice to have the more updated 
version.


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