issue_comments: 619270916

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https://github.com/pydata/xarray/issues/4002#issuecomment-619270916 https://api.github.com/repos/pydata/xarray/issues/4002 619270916 MDEyOklzc3VlQ29tbWVudDYxOTI3MDkxNg== 1217238 2020-04-24T22:52:29Z 2020-04-24T22:52:29Z MEMBER

We would take a PR to change these to default None and then x=x or {}

I like this pattern a little better, because it's clear it's comparing to a default value: python if x is None: x = {}

 
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