html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/754#issuecomment-220462553,https://api.github.com/repos/pydata/xarray/issues/754,220462553,MDEyOklzc3VlQ29tbWVudDIyMDQ2MjU1Mw==,10050469,2016-05-19T21:51:46Z,2016-05-19T21:51:46Z,MEMBER,"I'd be willing to prepare a PR, if this is still actual. Today I needed the *AllClose methods for my tests, I think it would be great to have these methods exposed.

I think I have an idea on how to proceed, but maybe I am underestimating the required amount of work.

Numpy for example has the `np.allclose` and `np.testing.assert_allclose` functions. Should xarray also have a `xr.allclose` function or are we happy with a `xr.testing.assert_allclose` alone? Also, the current xarray implementation has a different function for variables, datasets and coordinates: could these be merged in a generic `assert_allclose` which takes decisions on what to do based on the input type?
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