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Six was available for years (2011) before Mercurial even started porting (2015). https://github.com/benjaminp/six/graphs/contributors https://github.com/benjam

• eesmith 7y ago
  That was part of the "discusses this at length". Part of the relevant discussion is: > So I'm not sure six would have saved enough effort to justify the baggage of integrating a 3rd party package into Mercurial. (When Mercurial accepts a 3rd party package, downstream packagers like Debian get all hot and bothered and end up making questionable patches to our source code. So we prefer to minimize the surface area for problems by minimizing dependencies on 3rd party packages.)