issue_comments: 368108543

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https://github.com/pydata/xarray/issues/1938#issuecomment-368108543 https://api.github.com/repos/pydata/xarray/issues/1938 368108543 MDEyOklzc3VlQ29tbWVudDM2ODEwODU0Mw== 1217238 2018-02-23T19:07:46Z 2018-02-23T19:07:46Z MEMBER

As for my last concern, "Dispatch for the first argument(s) only" it looks like the simple answer is that multipledispatch already only dispatches based on positional arguments. So as long as we're strict about using keyword arguments for extra parameters like axis (which is good style anyways), we only need a single overload per array type for single dispatch functions like sum().

It looks like this resolves almost all of my concerns about using multiple dispatch.

One thing that would be nice is it VarArgs is actually distributed as part of multipledispatch rather than needing to be copied separately into xarray. That would make it easier for third parties to extend our operations, by simply importing VarArgs from multipledispatch rather than importing it from somewhere internal in xarray.

 
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